Works of: Roy S. Hopkins

Works of: Roy S. Hopkins
1 to 12 of 12
/ 1
Image Not Available
Documentary
Roy S. Hopkins
Patent- Mechanism for recording data in films
December 15, 1931
1998.0457.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic printing machine
November 10, 1931
1998.0456.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Indicating device for document photographing apparatus
October 6, 1931
1998.0455.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic printing machine
September 15, 1931
1998.0454.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Platen For Photographic Printing Machines
June 9, 1931
1998.0453.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Adjustable light sources for photographic printing machines
May 12, 1931
1998.0452.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printing and Vignetting Apparatus
April 7, 1931
1998.0451.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printing Machines
April 7, 1931
1998.0450.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printers
June 10, 1930
1998.0449.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Photographic Printer Vignetting Apparatus
January 7, 1930
1998.0448.0001
Image Not Available
Documentary
Roy S. Hopkins
Patent- Numbering Stamps For Photographic Printing Machines
June 11, 1929
1998.0447.0001
Image Not Available
Documentary
Charles W. Frederick
Patent- Defussing element
March 8, 1921
1998.0275.0001
/ 1

Review and updating of the museum's collection data is ongoing.
Inclusion of an object in this database does not guarantee its availability for loan.
For permission to use images from the online collections, please contact Image Rights and Reproductions.