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| All Patents in class 340/870.31 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,081,738 | May 25, 1937 | R.E. Conover | Sizing Device | ||
| 2,962,652 | Nov. 29, 1960 | S.L. Spidle (legal representitive), D.P. Youngberg (deceased, estate of), L.J. Bulliet | Position Indicator | ||
| 3,079,548 | Feb. 26, 1963 | K.A. Robinson | Electromechanical Signalling Apparatus | ||
 | 5,517,190 | May 14, 1996 | C.N. Gunn | Physical Measurement from changes in Reactance | |