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| All Patents in class 192/21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,295,516 | Sep. 08, 1942 | W.G. Hoelscher | Head Traverse Mechanism for Radial Drills | metalworking machine mechanisms | |
| 2,602,347 | Jul. 08, 1952 | P.V. Miller | Thread Gauge Drive | thread gages | |
| 2,619,880 | Dec. 02, 1952 | E.E. Hosea | Machine tool | milling machines | |
| 3,051,013 | Aug. 28, 1962 | A.I. Zagar | Forward and reverse friction drive tapping attachment | tapping machines | |