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| All Patents in class 346/140.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 689,529 | Dec. 24, 1901 | F.L. Wolfe | Recording Gage | ||
| 768,473 | Aug. 23, 1904 | C.J. Manning | Recording Pen | ||
| 2,213,098 | Aug. 27, 1940 | N.J. Smith | Pen for Recording Instruments | ||