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| All Patents in class 356/244 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,715,813 | Jun. 04, 1929 | R.O. Beardsley | Mounting for Screws and Taps | ||
| 1,737,579 | Dec. 03, 1929 | R.E. Flanders | Tap Holder for Comparators | ||
| 1,745,537 | Feb. 04, 1930 | J. Hartness | Cradle Carriage for Comparators | ||
| 2,506,498 | May 02, 1950 | L.B. Fuller | Specimen Holder for Comparators | ||