| Patents for Harold Longthorpe |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| GB-416,271 | Sep. 13, 1934 | H. Longthorpe | Improvements relating to centreless grinding machines | |
| GB-559,604 | Feb. 25, 1944 | H. Longthorpe | Improvements in centreless grinding or abrading machines | |
| GB-562,362 | Jun. 28, 1944 | H. Longthorpe | Improvements in centreless grinding or abrading machines | |
| GB-572,098 | Sep. 21, 1945 | H. Longthorpe | Improvements in centreless grinding machines | |
| GB-576,298 | Mar. 27, 1946 | H. Longthorpe | Improvements relating to precision grinding machines | |
| CA-433,914 | Apr. 02, 1946 | H. Longthorpe | Centreless Grinding or Abrading Machine | |
| GB-604,950 | Jul. 13, 1948 | H. Longthorpe | Improvements relating to centreless grinding machines | |
| GB-623,277 | May 16, 1949 | H. Longthorpe | Improvements in centreless grinding machines | |
