Works of: Ernest C. Allen

Works of: Ernest C. Allen
1 to 4 of 4
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Image Not Available
Documentary
Charles W. Frederick
Patent- Projecting system
1924/12/09
1998.0278.0001
Image Not Available
Documentary
Frederick W. Barnes
Patent- Permutation locked receptacles
1920/11/9
1997.2301.0001
Image Not Available
Documentary
Ernest C. Allen
Patent- Focusing Mechanism For Cameras
1915/07/20
1997.2270.0001
Image Not Available
Documentary
Ernest C. Allen
Patent- Loading Fixtures For Film Holders
1923/06/12
1997.2269.0001
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