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| All Patents in class 267/163 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,958,024 | May 08, 1934 | A.L. Stowell | Friction Spring | rules | |
| 2,184,448 | Dec. 26, 1939 | E.J. Witchger | Coiling device for measuring rules | ||