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US Patent: 1,812,455
Diaphragm chuck
Patentee: Byron F. Stowell (exact or similar names) - Springfield, MA USPTO Classifications: 279/139, 279/156 Tool Categories: metalworking machines : grinders Assignees: Van Norman Machine Tool Co. - Springfield, MA Manufacturer: Van Norman Machine Tool Co. - Springfield, MA Witnesses: Unknown	Patent Dates: Applied: Jul. 05, 1928 Granted: Jun. 30, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Van Norman Machine Tool Co.
Description: This chuck is intended for "holding the outer races off ball bearings for grinding."

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