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| All Patents in class 340/678 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,845,437 | Feb. 16, 1932 | M.K. Parkhurst | Measuring Device | ||
| 2,083,759 | Jun. 15, 1937 | J.C. Temple | Mechanism for Sizing | ||
 | 2,136,675 | Nov. 15, 1938 | L.A. Danse | Coating Measuring Device | |