Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 745
MEEKER DOORS CLOSED Vertical Section of the Elevator Shaft, showing the OperatingDevices in Position and connected to the Doors MEEKER DOORS OPENSectional \ie\v showing the Door Opening .AD\ANTAGES—The Opening and Closing Mechanism insures for a Freight Elevator, Safety, by preventing employees or…
Building materials
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