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US Patent: 3,739,150
Surface Plate and Controls Therefor Granite Surface Plate With Controlled Heat
Patentee: Rudolph J. Rahn (exact or similar names) - Dayton, Montgomery County, OH USPTO Classifications: 219/200, 219/218, 219/448.17, 219/462.1, 219/497, 33/567, 392/407 Tool Categories: metalworking tools : surface plates Assignees: Rahn Granite Surface Plate Co. - Dayton, Montgomery County, OH Manufacturer: Rahn Granite Surface Plate Co. - Dayton, Montgomery County, OH Witnesses: Unknown	Patent Dates: Applied: Jan. 05, 1971 Granted: Jun. 12, 1973 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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