Apparatus and method for increasing the efficiency of a door clo
Apparatus for holding a door open
Arrangement for controlling an angularly movable member
Automatic checking mechanism
Automatic door closer
Automatic door closer
Automatic door closer
Automatic door closer and process for assembly of same
Automatic door closer constructed for releasably holding a door
Automatic door closing device
Automatic door closing device
Braking apparatus for door closer
Control valve for door closer
Counterbalance mechanism
Damper and method of controlling a door
Damper apparatus
Damper device
Damper device
Damper for a pivot door
Damping device for hinges and the like