|
US3102580A
|
|
Chain hoist governor
|
|
US2957521A
|
|
Power unit for rolling door
|
|
US2839135A
|
|
Rolling door
|
|
US2621726A
|
|
Rolling door with slat therefor having windows
|
|
US2592888A
|
|
Rolling door with slat therefor having windows
|
|
US2495963A
|
|
Rolling door
|
|
US2430063A
|
|
Lateral guiding means for heavy door posts
|
|
US2315722A
|
|
Locking device
|
|
US2250604A
|
|
Rolling door with releasable guide groove
|
|
US2278706A
|
|
Device to motivate roller carriages on overhead tracks
|
|
US2221216A
|
|
Air operated device
|
|
US2070058A
|
|
Operator for roll top doors
|
|
US1998233A
|
|
Door-operating mechanism
|
|
US1992006A
|
|
Automatic spring apparatus to raise overhead doors
|
|
US1989658A
|
|
Door
|
|
US1997846A
|
|
Rolling door
|
|
US2062593A
|
|
Operator for roll top doors
|
|
US1989513A
|
|
Sectional door
|
|
US1989657A
|
|
Door
|
|
US1995431A
|
|
Sealing strip for roll top doors
|
