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| All Patents in class 356/394 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,377,069 | May 03, 1921 | J. Hartness | Mechanism for Gaging Screw Threads | ||
| 1,745,523 | Feb. 04, 1930 | R.O. Beardsley | Apparatus for Testing Taper Threaded Screws | ||