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| All Patents in class 407/91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,455,001 | Jul. 15, 1969 | F. Sirola | Cut-off tool | lathe tools | |
| 4,211,510 | Jul. 08, 1980 | D.A. Hopkins | Adjustable Boring Head | boring heads | |