APERTURE CARD WITH LOADING SLIT IN CARD
United States Patent 3491471
US Patent References:
/0707850.html
- - 0707850
Mount for chi-ray films or radiographs
- - 2701426
File card structure
- - 2861370
Film record card
- - 3220133
Aperture card
- - 3293786
/0707850.html
- - 0707850
Mount for chi-ray films or radiographs
- - 2701426
File card structure
- - 2861370
Film record card
- - 3220133
Aperture card
- - 3293786
Inventors:
Semple, Harry F.
Publication Date:
01/27/1970
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Export Citation:
Assignee:
Semple, Harry F.
Primary Class:
Other Classes:
40/709, 40/649
International Classes:
G06K19/04; G09F1/00