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| All Patents in class 340/870.44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,074,396 | Mar. 23, 1937 | W.H. Howe | Impedance Variation Amplifier | machine tool controls | |
| 2,083,759 | Jun. 15, 1937 | J.C. Temple | Mechanism for Sizing | grinding machines | |