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US Patent: 2,726,540
Hardness testing apparatus
Patentees: Michael G. Antonik (exact or similar names) - Detroit, MI Louis Small (exact or similar names) - Detroit, MI USPTO Classifications: 73/83 Tool Categories: metalworking tools : machinist tools : measuring tools : metal hardness testers Assignees: Service Diamond Tool Co. - Ferndale, MI Manufacturer: Service Diamond Tool Co. - Ferndale, MI Witnesses: Unknown	Patent Dates: Applied: Dec. 06, 1951 Granted: Dec. 13, 1955 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Service Diamond Tool Co.

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