Objects

Objects
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Image Not Available
Documentary
Roy S. Hopkins
Patent- Mechanism for recording data in films
1931/12/15
1998.0457.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic printing machine
1931/11/10
1998.0456.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Indicating device for document photographing apparatus
1931/10/06
1998.0455.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic printing machine
1931/09/15
1998.0454.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Platen For Photographic Printing Machines
1931/06/09
1998.0453.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Adjustable light sources for photographic printing machines
1931/05/12
1998.0452.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printing and Vignetting Apparatus
1931/04/07
1998.0451.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printing Machines
1931/04/07
1998.0450.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printers
1930/06/10
1998.0449.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printer Vignetting Apparatus
1930/01/07
1998.0448.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Numbering Stamps For Photographic Printing Machines
1929/06/11
1998.0447.0001
Image Not Available
Documentary
Charles W. Frederick
Patent- Defussing element
1921/03/08
1998.0275.0001
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