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US Patent: 4,786,221
Quick release chuck mechanism and method for achieving interchange ability of tool inserts therein
Patentee: Kenneth L. March (exact or similar names) - York, PA USPTO Classifications: 279/156, 279/74, 279/904, 408/239R, 409/218 Tool Categories: metalworking machines : drilling and boring : tapping machines Assignees: ETTCO Tool & Machine Co., Inc. - York, PA Manufacturer: ETTCO Tool Co., Inc. - Brooklyn, NY Witnesses: Unknown	Patent Dates: Applied: Aug. 25, 1986 Granted: Nov. 22, 1988 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for ETTCO Tool Co., Inc.
Description: This patent provides improvements on patent 2,338,626's tool-insert quick-release chuck mechanism.

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