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US2815842A
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Parking meters
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US2083762A
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Elevator-door check
|
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US2126066A
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Interlocking door and elevator mechanism
|
|
US2012440A
|
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Door actuating mechanism
|
|
US1906677A
|
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Door actuating means
|
|
US1856895A
|
|
Fire stop for elevator doors
|
|
US1695988A
|
|
Elevator-door-operating mechanism
|
|
US1528174A
|
|
Mail-bag-receiving device for aerial mail-delivery systems
|
|
US1574217A
|
|
Elevator-door-operating device
|
|
US1574216A
|
|
Fire stop for elevator doors
|
|
US1451353A
|
|
Fire door
|
|
US1293626A
|
|
Fire-door.
|
|
US1249566A
|
|
Fire-door.
|
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US1034848A
|
|
Fire-door.
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US1085713A
|
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Form for concrete columns.
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