(Inherited-Facet-Value Slot-Value-Type Elevator Sling_Underbeam Real-Number) (Inherited-Facet-Value Slot-Cardinality Elevator Sling_Underbeam 1) (<= (Has-Parameter-Slot $X Sling_Underbeam) (Elevator $X)) (Inherited-Slot-Value Elevator Has-Parameter-Slot Sling_Underbeam)