| All Patents in class 33/672 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 31,257 | Jan. 29, 1861 | N.F. Newell | Centering Bars of Iron | metal lathe accessories and attachments |
| 49,553 | Aug. 22, 1865 | S. Sawyer, E.E. Safford | Improved Adjustable Center-Punch | center punches |
| 50,442 | Oct. 17, 1865 | M. Bowker | Center-Punch | center punches |
| 316,918 | Apr. 28, 1885 | D.W. Standeford | Centering Gage | center marking gauges |
| 335,845 | Feb. 09, 1886 | C.A. Singer | Centering-tool | metal lathe accessories and attachments |
| 364,082 | May 31, 1887 | B.F. Bell | Center Marking Device | center marking gauges |
| 390,658 | Oct. 09, 1888 | C. Gage | Centering Gage | center marking gauges |
| 436,526 | Sep. 16, 1890 | A.P. Henderson | Centering Device | center marking gauges |
| 439,975 | Nov. 04, 1890 | W.O. Nelson | Caliper & Centering Gage | measurement gauges |
| 548,329 | Oct. 22, 1895 | F. Steemmerich | Key Seat Rule | rule attachments |
| 1,309,654 | Jul. 15, 1919 | J.R. Parks | Centering Tool | center marking gauges |
| 3,128,559 | Apr. 14, 1964 | R.R. Winter | Depth Micrometer | micrometers |
| 4,868,995 | Sep. 26, 1989 | L.G. Lee | Apparatus and method for marking center of turning billet | |
