| Patents for Hall Manufacturing Co. |
Patents 46 -
57
of 57
      |
| Number | Date | Patentee | Title | Type |
| GB-501,338 | Feb. 22, 1939 | H.M. Co. | Valve Seat Grinding Means | valve reseating tools |
| 2,150,621 | Mar. 14, 1939 | E.A. Hall | Pilot for Valve Seat Facing Tools | valve reseating tools |
| 2,176,071 | Oct. 17, 1939 | E.A. Hall | Collet Construction | collets and collet holders |
| 2,221,918 | Nov. 19, 1940 | K.R. Bohn, E.A. Hall | Valve Grinding Machine | valve grinding tools |
| 2,318,854 | May 11, 1943 | E.A. Hall | Portable Valve Seat Grinding Means | valve grinding tools |
| 2,338,484 | Jan. 04, 1944 | R.S. Beverlin | Grinding Tool | 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 |
| 2,363,384 | Nov. 21, 1944 | R.S. Beverlin | Method of Grinding Valve Seats and Similar Areas | valve grinding tools |
| CA-429,298 | Aug. 07, 1945 | R.S. Beverlin | Grinding Tool | valve and seat maintenance |
| 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 |
