| All Patents in class 33/672 |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
| | 31,257 | Jan. 29, 1861 | N.F. Newell | Centering Bars of Iron |
| | 49,553 | Aug. 22, 1865 | S. Sawyer, E.E. Safford | Improved Adjustable Center-Punch |
| | 50,442 | Oct. 17, 1865 | M. Bowker | Center-Punch |
| | 316,918 | Apr. 28, 1885 | D.W. Standeford | Centering Gage |
 | 335,845 | Feb. 09, 1886 | C.A. Singer | Centering-tool |
| | 364,082 | May 31, 1887 | B.F. Bell | Center Marking Device |
| | 390,658 | Oct. 09, 1888 | C. Gage | Centering Gage |
| | 436,526 | Sep. 16, 1890 | A.P. Henderson | Centering Device |
 | 439,975 | Nov. 04, 1890 | W.O. Nelson | Caliper & Centering Gage |
| | 548,329 | Oct. 22, 1895 | F. Steemmerich | Key Seat Rule |
