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| All Patents in class 407/78 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,316,615 | May 02, 1967 | T.V. Williams | Machine Tool | boring bars | |
| 3,598,499 | Aug. 10, 1971 | J.A. Dillon, Jr. | Boring Head Assembly | boring heads | |
| 4,211,510 | Jul. 08, 1980 | D.A. Hopkins | Adjustable Boring Head | boring heads | |