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US Patent: 3,143,356
Powerhead
Patentee: Percy E. Pray (exact or similar names) - Minneapolis, MN USPTO Classifications: 279/4.08, 279/51 Tool Categories: work holding metalworking machines : collet closers Assignees: None Manufacturer: Heinrich Tools Inc. - Racine, WI Witnesses: Unknown	Patent Dates: Applied: Aug. 06, 1963 Granted: Aug. 04, 1964 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Heinrich Co.
Description: The invention is a pneumatically operated collet closer, though the patent specification does not use "collet" in its description of the invention.

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