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| All Patents in class 33/639 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,750,272 | Jun. 14, 1988 | R.W. Caddell | Tool measuring device employing gap width detection | metalworking machine mechanisms | |
| 6,238,149 | May 29, 2001 | D.N. Hollinger, A.V. Bondi | Apparatus for drill press | drill presses | |
| 6,510,620 | Jan. 28, 2003 | R.G. Bender | Tool and method for the precision boring of holes | boring heads | |