| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Apgar scoring timer, device | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Timer switch | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| X-ray system high voltage switch | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Overhead infant phototherapy unit | Is a | False | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Pneumatic tourniquet system | Is a | False | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Time-concept assistive training device | Is a | False | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Assistive clock/timepiece | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Gas flow timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Laser exposure time tester | Is a | False | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Insulin pen timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Coagulation timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| X-ray system exposure timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Surgical scrub station timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Therapeutic radiation system exposure timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Phototherapy timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  | 
| Blood pressure cuff inflation timer | Is a | True | Timer, device | Inferred relationship | Existential restriction modifier |  |