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US Patent: 2,730,129
Tracer Control Mechanism
Patentees: Albert H. Dall (exact or similar names) - Cincinnati, Hamilton County, OH Hans Fritschi (exact or similar names) - Amberley Village, Hamilton County, OH USPTO Classifications: 137/636.1, 137/636.4, 251/3, 409/129, 74/471R, 91/36, 91/37 Tool Categories: Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 20, 1952 Granted: Jan. 10, 1956 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.

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