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| Patents Granted on 1975-04-01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,874,809 | Apr. 01, 1975 | R.S. Hahn | Apparatus for Machining Surface of Revolution Having Discontinuites | metalworking machine mechanisms | |
| 3,874,810 | Apr. 01, 1975 | W.D. Russell | Drill guide | drilling and boring | |