US Patent: 1,440,608
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| Drop Hammer Board
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Patentees:
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| Charles J. Kleist (exact or similar names) - Jamestown, Chautauqua County, NY |
| Harry E. Kleist (exact or similar names) - Jamestown, Chautauqua County, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 04, 1921 |
| Granted: |
Jan. 02, 1923 |
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Joel Havens
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