US Patent: 2,558,275
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| Lathe Control Mechanism
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Patentees:
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| Harold J. Siekmann (exact or similar names) - Cincinnati, OH |
| Harry C. Kemper (exact or similar names) - Goshen Township, Clermont County, OH |
| Nelson D. Cooper (exact or similar names) - Mariemont, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 21, 1949 |
| Granted: |
Jun. 26, 1951 |
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Joel Havens "Vintage Machinery" entry for R. K. Leblond Machine Tool Co.
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