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| Patents Granted on 1972-03-14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,648,377 | Mar. 14, 1972 | F.W. Witzke | Sling Roundness Gage | special purpose gauges | |
| 3,649,051 | Mar. 14, 1972 | S.E. Klabunde, G.H. Jones | Collector Ring Arrangement | metalworking machine mechanisms | |