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US Patent: 2,883,758
Apparatus for measuring the size and symmetry of an opening formed in a work piece
Patentee: Charles Zelnick (exact or similar names) - Saginaw, MI USPTO Classifications: 33/544.5 Tool Categories: Assignees: Lufkin Rule Company - Saginaw, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 07, 1956 Granted: Apr. 28, 1959 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen

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