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| Patents for Leonard J. Kowal | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,887,917 | May 26, 1959 | L.J. Kowal | Tube bender scale means | pipe and tube benders | |
| 3,685,335 | Aug. 22, 1972 | L.J. Kowal | Tube bender | pipe and tube benders | |