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| All Patents in class 408/197 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,543,224 | Feb. 27, 1951 | W.J. Blazek | Adjustable reamer | reamers | |
| 3,069,937 | Dec. 25, 1962 | T.V. Williams | Clamp and Bit Holder | milling machine cutters | |
| 3,089,358 | May 14, 1963 | M.D. Spurgeon | Adjustable Boring Head | boring heads | |
| 3,782,849 | Jan. 01, 1974 | S. Mizoguchi | Boring Head | boring heads | |
| 4,211,510 | Jul. 08, 1980 | D.A. Hopkins | Adjustable Boring Head | boring heads | |