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| All Patents in class 144/421 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,374,257 | Apr. 24, 1945 | G. Davenport | Motor Control System | ||
| 2,427,493 | Sep. 16, 1947 | E.P. Bullard | Control Mechanism | ||
 | 2,918,951 | Dec. 29, 1959 | G. Haumann | Control mechanism for lumber processing | |
 | 2,987,085 | Jun. 06, 1961 | B.E. Porter | Automatic sequencing wood saw and clamp | |