US Patent: 1,954,918
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| Means to prevent Double Exposures in Using Plate or Film Holders for Cameras
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Patentees:
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| William E. Burnell (exact or similar names) - Penn Yan, Yates County, NY |
| William H. Petit (exact or similar names) - Rochester, Monroe County, NY |
| Charles H. Roth (exact or similar names) - Rochester, Monroe County, NY |
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Patent Dates:
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| Applied: |
Sep. 03, 1932 |
| Granted: |
Apr. 17, 1934 |
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Patent Pictures:
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Joel Havens
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