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| Patents Granted on 1972-05-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,664,025 | May 23, 1972 | F.D. Barto | Combination Marking Gage and Trammels | marking gauges | |
| 3,664,755 | May 23, 1972 | L.J. Caras | Finishing Boring Head | boring heads | |
| 3,664,947 | May 23, 1972 | M.M. Bass | Work holder for electrochemical abrading machine | ||
| 3,665,169 | May 23, 1972 | L.E. Miller, R. Zechlin, R.M. Henderson | Electronic Measuring Unit | electrical measuring apparatus | |