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| All Patents in class 33/673 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 39,193 | Jul. 07, 1863 | J. Adt | Centering Anvil | ||
| 391,533 | Oct. 23, 1888 | J.E. Howard | Centering Apparatus | ||
 | 432,328 | Jul. 15, 1890 | J.A. Painter | Center and Mortise-Gage | |
 | 644,430 | Feb. 27, 1900 | W. Johnson | Center Gage | |
 | 651,328 | Jun. 05, 1900 | R. Guilmette | Center Scratch Gage | |
 | 824,975 | Jul. 03, 1906 | E.L. Cook | Centering Device | |
 | 1,255,507 | Feb. 05, 1918 | F.H. Brennan | Centering Device | |
| 1,373,367 | Mar. 29, 1921 | B. Summers | Centering Square | ||