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US Patent: 3,087,246
Determining reference plate for surface plate inspection
Patentee: Theodore N. Busch (exact or similar names) - Savage, MN USPTO Classifications: 235/61GM, 33/1BB, 33/1R Tool Categories: metalworking tools : machinist tools : measuring tools Assignees: Doall Co. - Des Plaines, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 15, 1960 Granted: Apr. 30, 1963 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for DoALL Co., Inc.

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