| All Patents in class 451/143 |
Patents 31 -
45
of 74
      |
| Number | Date | Patentee | Title | Type |
| 1,026,389 | May 14, 1912 | E.J. McClellan, G.K. Garvin | Hole Grinding Machine | grinding machines |
| 1,052,455 | Feb. 11, 1913 | J.C. Blevney | Polishing-machine | sanding machines |
| 1,337,139 | Apr. 13, 1920 | G.C. Kimmel | Grinding Machine | internal grinders |
| 1,337,140 | Apr. 13, 1920 | G.C. Kimmel | Grinding Machine | internal grinders |
| 1,522,465 | Jan. 06, 1925 | G.C. Kimmel | Internal Grinding Machine | internal grinders |
| 1,534,301 | Apr. 21, 1925 | P. Conradson | Grinding Machine | internal grinders |
| 1,534,302 | Apr. 21, 1925 | K.F. Gallimore, H.E. Kempton, P. Conradson | Grinding Machine | internal grinders |
| 1,535,452 | Apr. 28, 1925 | P. Conradson | Grinding Machine | internal grinders |
| 1,541,370 | Jun. 09, 1925 | L.T. Medholdt | Setting, grinding, and balancing machine | sharpening machines |
| 1,548,563 | Aug. 04, 1925 | H.K. Spencer | Means For Handling Articles | grinding attachments |
| 1,612,830 | Jan. 04, 1927 | C.G. Olson | Grinding machine | gear hobbing machines |
| 1,632,600 | Jun. 14, 1927 | F.O. Hoagland | Internal Grinding Machine | internal grinders |
| 1,646,801 | Oct. 25, 1927 | G.W. Fleming, F.D. Van Norman | Triple grinding machine | grinders |
| 1,662,079 | Mar. 13, 1928 | O. Severson | Machine for Grinding Hob and Disk Cutters | hob grinding machines |
| 1,662,821 | Mar. 20, 1928 | S. Einstein | Internal Grinder | grinding machines |
