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| All Patents in class 219/69.18 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,966,374 | Dec. 27, 1960 | H. Jensen | Packing for Face Type Seals | ||
| 3,988,560 | Oct. 26, 1976 | H.D. Kauffman, J.R. Witzel, J.E. Losey | Method and Apparatus for Controlling Generation of Machining Pulses in EDM Power Supply | ||