| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Breathing gas mixer | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Portable air compressor | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Stationary liquid oxygen container | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Portable liquid oxygen unit | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Ether hook | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia/respiratory gas flowmeter | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen therapy flowmeter | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Gas cylinder holder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Cylinder/system medical gas pressure gauge | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| High-pressure medical gas tubing | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen administration tubing | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Helium/oxygen quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen low pressure tubing | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide/oxygen cylinder | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Helium/oxygen cylinder | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical air quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Helium/oxygen quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthetic gas scavenging quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide/oxygen quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical air quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Valved nitrous oxide/oxygen cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen therapy conserving regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide/oxygen quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical air low pressure tubing | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthetic gas scavenging quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen quick-connect coupling, female | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Gas flow timer | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitrous oxide low pressure tubing | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen quick-connect coupling, male | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Valved helium/oxygen cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Heated respiratory humidifier | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia/respiratory gas flowmeter tester | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| High-flow heated respiratory humidifier | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Non-heated respiratory humidifier | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthesia/respiratory carbon dioxide cylinder | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical gas pipeline system automatic outlet analyzer | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Nitric oxide cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Calibration gas cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fire safety valve | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Anesthetic gas absorption/desorption device | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Inspiratory line humidification chamber, reusable | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Inspiratory line humidification chamber, single-use | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fixed-regulator oxygen cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical gas delivery line filter, respiratory | Is a | False | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Medical air cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fixed oxygen cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fixed medical air cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fixed helium/oxygen cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Fixed nitrous oxide/oxygen cylinder regulator | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Emergency oxygen production system | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Emergency oxygen production system cartridge | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Low-pressure medical gas tubing | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Oxygen+nitrous oxide cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  | 
| Helium+oxygen cylinder | Is a | True | Anesthesia and respiratory gas supply equipment | Inferred relationship | Existential restriction modifier |  |