| All Patents in class 451/488 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
| | 115,414 | May 30, 1871 | J. Barker | Improvement in Sand Papering Machines |
 | 1,155,176 | Sep. 28, 1915 | F.D. Van Norman | Cooling a grinder spindle |
| | 2,257,849 | Oct. 07, 1941 | M.E. Martellotti | Machine Tool Temperature Contol |
 | 2,439,596 | Apr. 13, 1948 | S.A. Crosby | Air filter for polishing machines |
 | 2,486,947 | Nov. 01, 1949 | W.P. Hilger | Surface finishing device |
| | 3,448,023 | Jun. 03, 1969 | R.M. Bell | Belt type electro-chemical (or electrolytic) grinding machine |
| | 4,240,232 | Dec. 23, 1980 | J.C. Chwae | Coated Abrasive Superfinishing Stone and Method of Making Same |
