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| All Patents in class 235/144.0PN | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 707,652 | Aug. 26, 1902 | E.W. Sibley | Calculator | |
 | 744,295 | Nov. 17, 1903 | W.U. Colthar | Spring-motor | |
 | 888,599 | May 26, 1908 | E. Ek | Meter | |
 | 1,392,573 | Oct. 04, 1921 | E. Ek | Register for lineal measuring | |