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| All Patents in class 407/97 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,848,913 | Aug. 26, 1958 | N.C. Thomsen | Self Centering Multiple Boring Tool Holder | lathe tool holders and tool posts | |
| 3,316,615 | May 02, 1967 | T.V. Williams | Machine Tool | boring bars | |