|
US3590529A
|
|
Garage door up-returner and circuit breaker
|
|
US3508631A
|
|
Pivotally mounted gravity actuator
|
|
US3519055A
|
|
Motor operated door
|
|
US3548619A
|
|
Vehicle-borne unlocker of combination-lock
|
|
US3510982A
|
|
Safety timer
|
|
US3481387A
|
|
Door operator
|
|
US3444344A
|
|
Reversible door operator switch
|
|
US3248630A
|
|
Door-operators
|
|
US3060361A
|
|
Multi-timer door actuator
|
|
US3036256A
|
|
Baffle partitioned capsule for door operators
|
|
US2986689A
|
|
Light-sensitive control means for door operators
|
|
US3048761A
|
|
Door-operators
|
|
US3147001A
|
|
Door-operators
|
|
US2902276A
|
|
Door-operators and controls
|
|
US2926727A
|
|
Doors
|
|
US2859960A
|
|
Electrical control responsive to successive circuit interruptions
|
|
US2876002A
|
|
Control systems
|
|
US2758836A
|
|
Door-operators
|
|
US2850088A
|
|
Doors
|
|
US2689726A
|
|
Closure-operator
|
