Classifications: Documentary

Classifications: Documentary
529 to 552 of 1,338
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Image Not Available
Documentary
Rudolf Meingast
Patent- Process of Manufacturing Acetic Anhydride
August 4, 1931
Image Not Available
Documentary
Rudolf Meingast
Patent- Process of Manufacturing Acetic Anhydride
July 26, 1927
Image Not Available
Documentary
Rudolf Meingast
Patent- Process of Manufacturing Acetic Anhydride
January 19, 1926
Image Not Available
Documentary
Dr. C. E. K. Mees
Patent- Method of Making Multicolor Screens
April 10, 1928
Image Not Available
Documentary
Dr. C. E. K. Mees
Patent- Method of Making Photographic Records
August 5, 1924
Image Not Available
Documentary
Irving C. Matthews
Patent- Cellulose ether compositions
October 9, 1923
Image Not Available
Documentary
Frederick C. Martin
Patent- X-ray Fluorescent Screen Mountings
September 15, 1931
Image Not Available
Documentary
Frederick C. Martin
Patent- X-ray dental film package
February 25, 1930
Image Not Available
Documentary
Frederick C. Martin
Patent- Packages For Sensitized Materials For X-ray Purposes
January 8, 1929
Image Not Available
Documentary
Walter D. Marshall
Patent- Film Looping Device For Motion Picture Processing Machines
October 18, 1927
Image Not Available
Documentary
Walter D. Marshall
Patent- Cameras
July 31, 1917
Image Not Available
Documentary
Harry I. Marles
Patent- Dental x-ray film packages
June 7, 1927
Image Not Available
Documentary
Paul J. Marks
Patent- Multiple Aperture Shutters
February 3, 1920
Image Not Available
Documentary
Paul J. Marks
Patent- Detachable shutter releasing devices
July 23, 1918
Image Not Available
Documentary
Paul J. Marks
Patent- Shutter Actuating Device
June 25, 1918
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
June 25, 1918
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
February 26, 1918
Image Not Available
Documentary
Paul J. Marks
Patent- Shutter Actuating Device
February 12, 1918
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
October 16, 1917
Image Not Available
Documentary
Paul J. Marks
Patent- Controlling mechanism for photographic shutters
September 11, 1917
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
September 4, 1917
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
August 28, 1917
Image Not Available
Documentary
Paul J. Marks
Patent- Shutter Operating Devices
February 6, 1917
Image Not Available
Documentary
Paul J. Marks
Patent- Photographic Shutters
February 6, 1917
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