US Patent: 2,697,373
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| Tracer Controlled Facing Lathe
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Patentees:
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| Harold J. Siekmann (exact or similar names) - Cincinnati, OH |
| George J. Kasselmann (exact or similar names) - Cincinnati, OH |
| George W. Luning (exact or similar names) - Cincinnati, 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: |
May 08, 1952 |
| Granted: |
Dec. 21, 1954 |
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Joel Havens "Vintage Machinery" entry for R. K. Leblond Machine Tool Co.
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