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Class Information
Number: 470/203
Name: Threaded, headed fastener, or washer making: process and apparatus > Implement, e.g., die, etc. > Tap > Collapsible > Wedge core
Description: Subject matter wherein the device is actuated by a triangular shaped or conical surface which engages the device.

Patents under this class:

Patent Number Title Of Patent Date Issued
5718636 Rethreader tool Feb. 17, 1998
4661028 Reverse cutting expansion tap Apr. 28, 1987
4229127 Boring bar Oct. 21, 1980

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