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US Patent: 1,456,938
Instument for Testing and Comparing the Lead of a Screw Thread
Patentee: Arthur W. Schoof (exact or similar names) - Greenfield, MA USPTO Classifications: 33/199R, 33/501.05, 33/787 Tool Categories: layout tools : measurement gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Oct. 07, 1921 Granted: May 29, 1923 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: Harry W. Bowen - patent attorney

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