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| All Patents in class 235/144.0PN | |||||
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| Number | Date | Patentee | Title | Type | |
| 707,652 | Aug. 26, 1902 | E.W. Sibley | Calculator | ||
| 888,599 | May 26, 1908 | E. Ek | Meter | wood planer accessories | |
| 1,392,573 | Oct. 04, 1921 | E. Ek | Register for lineal measuring | wood planer accessories | |