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