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Simpson, Orville. Elevator drawing labeled sky and lobby.tif
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Simpson, Orville. Sketch of "2nd floor main elevator lobby each tower corner".tif
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Simpson, Orville. Elevator sketch.tif
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Simpson, Orville. Freight elevator sketch from 1-103 floor.tif
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Simpson, Orville. Elevator sketch with key.tif
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Simpson, Orville. Elevator sketch with key for elevators called "Express" and "Random".tif
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Simpson, Orville. Partial section of larger sketch of conceptual rendering of Elevator Building.tif
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Simpson, Orville. Main elevator building sketch.tif
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Simpson, Orville. Elevator: handwritten logistics of floors with mathematical calculations.tif
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Simpson, Orville. Freight elevator sketch.tif
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