| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Ear fitting hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Visual and hearing impairment device | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Body worn hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Head worn hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Putting on hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Checking hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Hearing aid provision | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fitting of hearing aid | Using | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Implantation of electromagnetic hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of hearing aid battery | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 2 | 
| Turning off hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Listening for feedback whistle of hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Checking ear mold and tubing | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Switching on hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fit hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Changing hearing aid battery | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid procedure | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Attention to hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Take ear impression | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Fit ear mold | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fit ear mold for existing hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 2 | 
| Fit ear mold for swim plug | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 2 | 
| Fit ear mold for hearing protection | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 2 | 
| Fit tinnitus masker | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Adjust hearing aid settings | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fitting of hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provide head worn hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provide body worn hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of hearing aid battery | Indirect device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fitting of external hearing prosthesis to bone anchored fixtures | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of hearing implant into middle ear | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of hearing implant in external ear | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fitting of hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of hearing aid battery | Indirect device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Adjust hearing aid settings | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Checking hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Switching on hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Putting on hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Checking ear mold and tubing | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Replacement of hearing aid battery | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 2 | 
| Listening for feedback whistle of hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Turning off hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Fitting of external hearing prosthesis to bone anchored fixtures | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Attention to hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Modification of hearing aid mold | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provision of replacement hearing aid component | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provision of replacement hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Hearing aid provision | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provide body worn hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provision of replacement hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provision of replacement hearing aid component | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provide head worn hearing aid | Direct device | True | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Tactile hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Air-conduction hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Bone-conduction hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Earmould impression kit | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Earmould | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Headphones | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid master | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Ear trumpet | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Middle ear implantable mold | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid tester | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Earmould impression material | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Audiometric/hearing aid tester | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Audiometric/hearing aid tester control unit | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Audiometric/hearing aid tester application software | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Transcutaneous air-conduction hearing aid tube | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid wireless-fitting computer-aided set | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid remote control | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid enhanced audio device, teaching-environment | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Earphone cushion | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid enhanced audio device, telecommunication/multimedia | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Contralateral hearing unit | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid fitting/programming application software | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid enhanced audio attachment | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid neck induction loop, wireless input | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid neck induction loop, passive | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid neck induction loop, active | Is a | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing aid wax guard | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Head-worn bone-conduction hearing aid base plate | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Bone-conduction hearing implant system sound processor | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Tympanic membrane contact hearing aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Tympanic membrane contact hearing aid sound processor | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Tympanic membrane contact hearing aid light transducer | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Tympanic membrane contact hearing aid tympanic transducer | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Television set listening aid | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Bone-conduction hearing implant system partially-implantable abutment | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Bone-conduction hearing implant system vibration transmission screw | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Bone-conduction hearing implant system vibration transmission plate | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Hearing implant system sound processor pad | Is a | True | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Fitting of external hearing prosthesis to bone anchored fixtures | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Attachment of bone anchored hearing prosthesis | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Adjustment of cochlear implant processor | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Modification of hearing aid mould | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier |  | 
| Provision of replacement hearing aid | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 | 
| Provision of replacement hearing aid component | Direct device | False | Hearing aid, device | Inferred relationship | Existential restriction modifier | 1 |