| Patents Granted on 1981-06-?? |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 4,270,275 | Jun. 02, 1981 | D.R. McMurtry | Probes | |
| 4,270,743 | Jun. 02, 1981 | C.P. Crompton | Forward numbering or underlap sheet delivery | |
| 4,272,216 | Jun. 09, 1981 | J.G. Osburn | Machine Tool Lubrication System | metalworking machine lubrication |
| 4,274,231 | Jun. 23, 1981 | J. Verega | Method and Apparatus for Dressing a Grinding Wheel | grinder dressers |
| 4,274,309 | Jun. 23, 1981 | P.E. Lenker | Method of Manufacture of Certain Hand Wrenches and the Like | ratchet wrenches |
| CA-1,103,992 | Jun. 30, 1981 | M.J. Neal | Adjustable vane centrifugal pump impeller construction | |
