US Patent: 2,713,246
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| Tracer Control Mechanism Having Independent Rate and Direction Control
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Patentees:
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| Albert H. Dall (exact or similar names) - Cincinnati, Hamilton County, OH |
| Hans Fritschi (exact or similar names) - Amberley Village, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 01, 1953 |
| Granted: |
Jul. 19, 1955 |
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Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.
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