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| All Patents in class 83/54 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,776,003 | Jan. 01, 1957 | F. Koster | Method and Apparatus for Cutting Tubing | pipe and tube notchers | |
| 3,074,302 | Jan. 22, 1963 | H. May, E. Coulon | Method of Preparing Mitered Tubular Joints | pipe and tube notchers | |
| 3,698,274 | Oct. 17, 1972 | D.C. Mohr, B.J. Miller, E.I. Coulon | Apparatus for Piercing Openings in Tubing | pipe and tube notchers | |