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Patent Drawing of Engine - for N. P. Otis and R. C. Schmidt's Elevator Public domain image
Zusammenfassung
Utility Patent Drawings
Public domain photograph of French architecture design drawing, building plan, Paris, France, free to use, no copyright restrictions image - Picryl description
Berühmte Patentzeichnungen aus dem National Archives, Washington DC
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Datum
18/10/1881
Quelle
The U.S. National Archives
Copyright-info
No known copyright restrictions
