| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Single-breath inhalational induction | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Multiple-breath inhalational induction | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, semi-closed, no rebreathing of primary agent | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, semi-closed, circulation of primary agent and gases | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, closed, circulation of primary agent | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, closed, no rebreathing of primary agent | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, semi-closed, rebreathing of primary agent | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  | 
| Inhalation anesthesia, machine system, closed, rebreathing of primary agent | Is a | True | Inhalational induction | Inferred relationship | Existential restriction modifier |  |