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US Patent: 2,056,144
Light Valve for Plate or Film Holders
Patentee:
Charles H. Roth (exact or similar names) - Rush, Monroe County, NY

USPTO Classifications:
396/518, 396/524, 396/526

Tool Categories:
photographic apparatus : film and plate holders

Assignees:
Folmer Graflex Corp. - Rochester, Monroe County, NY

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: May 20, 1936
Granted: Sep. 29, 1936

Patent Pictures:
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