| Patents for Ernest A. Hall |
Patents 31 -
35
of 35
      |
| Number | Date | Patentee | Title | Type |
| 2,318,854 | May 11, 1943 | E.A. Hall | Portable Valve Seat Grinding Means | valve grinding tools |
| 2,338,509 | Jan. 04, 1944 | E.A. Hall, R.S. Beverlin | Grinding Machine | valve grinding tools |
| 2,338,763 | Jan. 11, 1944 | E.A. Hall, R.S. Beverlin | Portable Grinding Machine | valve grinding tools |
| CA-429,299 | Aug. 07, 1945 | E.A. Hall, R.S. Beverlin | Portable Grinding Machine | valve and seat maintenance |
| CA-429,300 | Aug. 07, 1945 | E.A. Hall, R.S. Beverlin | Grinding Machine | valve and seat maintenance |
