| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Anesthetic face mask | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Oxygen mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Administration of medication using nebulizer mask | Using device | False | Mask | Inferred relationship | Existential restriction modifier | 1 | 
| Administration of medication using nebulizer mask | Using device | False | Mask | Inferred relationship | Existential restriction modifier | 1 | 
| Administration of medication using nebulizer mask | Using device | True | Mask | Inferred relationship | Existential restriction modifier | 1 | 
| Tube/mask breathing circuit connector, reusable | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Tube/mask breathing circuit connector, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Y-piece breathing circuit connector, reusable | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Y-piece breathing circuit connector, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Portable liquid oxygen unit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Cardiopulmonary resuscitation kit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Phototherapy eye protector, reusable | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia mask strap | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Cardiopulmonary stress exercise monitoring system | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Aerosol delivery tubing | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Oxygen administration tubing | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Nebulizing system tubing set | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Suspect blood deoxyribonucleic acid forensic evidence kit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Hair forensic evidence kit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia mask stabilizer | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Postmortem sexual-assault forensic evidence kit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Phototherapy eye protector, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Esophageal-obturating airway, reusable | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Esophageal-obturating airway, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Postmortem blood deoxyribonucleic acid forensic evidence kit | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Automatic pneumatic pulmonary resuscitator, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Eye mask | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Face radiation shield | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Moisture chamber face mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Non-rebreathing valve, reusable | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Nasal air filter, fabric | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Non-rebreathing valve, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Oxygen administration kit, sterile | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Oxygen administration kit, non-sterile | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia mask strap, single-use | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Emergency oxygen production system | Is a | False | Mask | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia and respiratory mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Tracheostomy mask, aerosol | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Diabetic retinopathy phototherapy mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  | 
| Facial burn pressure therapy mask | Is a | True | Mask | Inferred relationship | Existential restriction modifier |  |