Torsion rod cover support
Torsion rod hinge construction
Torsion spring assembly
Torsion spring tensioning apparatus
Torsionally balanced hatchway door constructions
Totally enclosed door check
Touch-sensitive door control device
Traffic responsive control system for automatic swinging door
Transit car door system and operation
Transit car power door obstruction sensing system and device
Transit vehicle door system
Transmitter for use in a remote control apparatus
Transmitting chain for an automobile electric window
Trapping protector for power-operated closing device
Twin sprocket garage door opener
Twist lock window regulator pivot pin
Two drum cable drive garage door opener
Two knuckle hinges
Two motor arrangement for a door operator
Two-door opener remote control