US Patent: 450,214
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| Camera
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Patentees:
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| Thomas H. Blair (exact or similar names) - Boston, Suffolk County, MA |
| John H. Crowell (exact or similar names) - Vineyard Haven, Dukes County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 09, 1890 |
| Granted: |
Apr. 14, 1891 |
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Patent Pictures:
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Joel Havens
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