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US Patent: 3,159,469
Gradient temperature normalizer for surface plates or blocks
Patentees: Ivan J. Rahn (exact or similar names) - Dayton, OH Rudolph J. Rahn (exact or similar names) - Dayton, OH USPTO Classifications: 108/50.13, 33/567, 34/237, 34/523, 65/348 Tool Categories: metalworking tools : machinist tools : measuring tools Assignees: Rahn Granite Surface Plate Co. - Dayton, OH Manufacturer: Rahn Granite Surface Plate Co. - Dayton, OH Witnesses: Unknown	Patent Dates: Applied: Oct. 04, 1961 Granted: Dec. 01, 1964 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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