| All Patents in class 451/216 |
Patents 1 -
15
of 22
      |
| Number | Date | Patentee | Title | Type |
| 6,949 | Dec. 11, 1849 | J. Vaughan, Jr. | Machine for Grinding or Polishing Tools | polishing and buffing machinery |
| 197,711 | Nov. 27, 1877 | E.J. Worcester | Improvement in machines for grinding lawn-motor cutter | grinders |
| 248,744 | Oct. 25, 1881 | B. Holmes | Machine for grinding steel bars | grinders |
| 286,663 | Oct. 16, 1883 | H.F. Wheeler | Grinding Machine for Producing the Relief on Twist and Fluted Drills | tool grinders |
| 299,433 | May 27, 1884 | A. Coventry, W.F. Smith | Machinery for Grinding or Sharpening Drills | drill grinders |
| 364,353 | Jun. 07, 1887 | R. Kampfe | Machinery for Grinding Cutlery | glass grinding machines |
| 607,628 | Jul. 19, 1898 | F.A. Shea, Administrator, M. Reece, administrator, J. Reece, Estate of (deceased) | Machine for Foming Irregular Cam Grooves | cam making machines |
| 1,515,568 | Nov. 11, 1924 | R.W. Ellingham, G.W. Fleming | Grinding machine | cylindrical grinders |
| 1,666,500 | Apr. 17, 1928 | N.I. Lundberg | Metal Working Tool | grinders |
| 1,794,271 | Feb. 24, 1931 | H.H. Asbridge | Grinding machine | |
| 1,871,494 | Aug. 16, 1932 | G.A. Carlson | Grinding and polishing machine | polishing and buffing machinery |
| 1,991,958 | Feb. 19, 1935 | M. Romaine | Grinding Machine | grinding machines |
| 2,136,491 | Nov. 15, 1938 | E.S. Cornell | Metalworking Machine | surface grinders |
| 2,314,312 | Mar. 16, 1943 | W.C. Knapp | Grinding method and apparatus | |
| 2,346,866 | Apr. 18, 1944 | H. Pelphrey | Fixture for forming Gear Cutters | gear cutting tools |
