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| All Patents in class 407/75 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,916,802 | Dec. 15, 1959 | J.H. Blomstrand | Tool Holder | metalworking machine tool holders | |
| 3,295,187 | Jan. 03, 1967 | H.R. Plummer | Adjustable Block Type Cutting Tool With Clamped on Insert Blades | insert tool holders | |
| 4,231,691 | Nov. 04, 1980 | H. Woerz, D. Pape | Dual Cutter Boring Head | boring heads | |