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| All Patents in class 33/561 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 4,145,816 | Mar. 27, 1979 | R. Johnstone, R.E. Stobbe | Spindle Probe With Orbital Transformer | ||
 | 4,270,275 | Jun. 02, 1981 | D.R. McMurtry | Probes | |
| 5,058,433 | Oct. 22, 1991 | D.R. McMurtry | Touch probe | ||
 | 5,146,691 | Sep. 15, 1992 | D.R. McMurtry | Touch probe | |
 | 5,517,190 | May 14, 1996 | C.N. Gunn | Physical Measurement from changes in Reactance | |