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| All Patents in class 72/31.04 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,670,650 | Mar. 02, 1954 | R.W. Willmotte | Electronic Limit Micrometer | micrometers | |
| 2,887,917 | May 26, 1959 | L.J. Kowal | Tube bender scale means | pipe and tube benders | |