| All Patents in class 451/418 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 459,572 | Sep. 15, 1891 | A.K. Bonta | Commutator Turning Device | commutator truing tools |
| 586,514 | Jul. 13, 1897 | P.B. Bosworth | Commutator Truing Device | commutator dressing machines |
| 632,666 | Sep. 05, 1899 | F. Wilkie | Commutator Grinding Rig | commutator dressing machines |
| 635,346 | Oct. 24, 1899 | R.S. Papprill | Tool for Abrasive Purposes | commutator truing tools |
| 651,342 | Jun. 12, 1900 | E.D. Carr | Commutator-Truing Device | commutator truing tools |
| 660,618 | Oct. 30, 1900 | P.B. Bosworth | Device for truing commutators | commutator dressing machines |
| 723,399 | Mar. 24, 1903 | J.B. MacIntosh | Device for Filing Commutators for Dynamos or Motors | commutator truing tools |
| 803,657 | Nov. 07, 1905 | O. Zschockelt | Collector-Polisher | commutator dressing machines |
| 945,784 | Jan. 11, 1910 | O.E. Hunt | Commutator Truing Machine | commutator truing tools |
| 971,753 | Oct. 04, 1910 | O.E. Hunt | Commutator Truing Machine | |
| 982,367 | Jan. 24, 1911 | W.H. Jordan | Machine for Grinding Commutators of Dynamos and Motors | commutator truing tools |
| 1,395,880 | Nov. 01, 1921 | D.W. Ward | Commutator Brush Reseating Tool | brush reseating tools |
| 1,968,215 | Jul. 31, 1934 | N.F. McNaught, E.H. Peterson | Tool for cleaning commutators and the like | |
