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| All Patents in class 408/185 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,043,696 | Aug. 23, 1977 | G. Wohlhaupter | Micrometer Boring Head | boring heads | |
| 4,231,691 | Nov. 04, 1980 | H. Woerz, D. Pape | Dual Cutter Boring Head | boring heads | |