| Patents for John Derick Barclay |
Patents 1 -
4
of 4
      |
| Number | Date | Patentee | Title | Type |
| GB-1,155,963 | Jun. 25, 1969 | J.D. Barclay, J.C. Jones | Improvements in or relating to grinding machines | roll grinding machines |
| GB-1,155,964 | Jun. 25, 1969 | J.D. Barclay, J.C. Jones | Improvements in or Relating to Grinding Machines | roll grinding machines |
| CA-838,788 | Apr. 07, 1970 | J.D. Barclay, J.C. Jones | Motor Control System for Grinding Machines | roll grinding machines |
| CA-875,208 | Jul. 06, 1971 | J.C. Jones, J.D. Barclay | Grinding Machines | roll grinding machines |
