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US Patent: 3,072,768
Built-in switch for insulated portable electric tools
Patentees: Joseph P. Yelpo (exact or similar names) - Somerville, NJ Reynold Happe (exact or similar names) - Princeton, NJ USPTO Classifications: 200/277, 200/432, 200/522 Tool Categories: handheld power tools Assignees: Diehl Mfg. Co. - Somerville, NJ Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 02, 1960 Granted: Jan. 08, 1963 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Diehl Mfg. Co.

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