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US Patent: 2,231,465
Tapping attachment
Patentee: George W. Emrick (exact or similar names) - Brooklyn, NY USPTO Classifications: 192/113.2, 192/48.91, 408/124, 408/140, 470/181, 74/377, 74/606R Tool Categories: metalworking machines : drilling and boring : tapping heads and chucks Assignees: None Manufacturer: ETTCO Tool & Machine Co., Inc. - Brooklyn, NY Witnesses: Unknown	Patent Dates: Applied: Jul. 11, 1939 Granted: Feb. 11, 1941 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 adds air-cooling provisions to the inventor's tapping head.

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