| Patents for Ernest A. Hall |
Patents 16 -
30
of 35
      |
| Number | Date | Patentee | Title | Type |
| 1,909,347 | May 16, 1933 | E.A. Hall | Cylinder Working Tool | reamers |
| 1,918,642 | Jul. 18, 1933 | E.A. Hall | Cylinder Reamer | reamers |
| 1,922,202 | Aug. 15, 1933 | W.E. Heuer, E.A. Hall | Cylinder Working Tool | honing tools |
| 1,938,330 | Dec. 05, 1933 | E.A. Hall | Suction Nozzle for Valve-Seat Grinders | valve reseating machines |
| 1,955,182 | Apr. 17, 1934 | E.A. Hall | Suction Device for Cylinder Boring Machines | dust collectors |
| 1,955,183 | Apr. 17, 1934 | E.A. Hall | Tool Balancing Means | valve grinding tools |
| 2,010,759 | Aug. 06, 1935 | E.A. Hall | Pilot Stem | valve grinding tools |
| 2,042,782 | Jun. 02, 1936 | E.A. Hall | Dust Removing Means for Valve Seat Grinders or the Like | dust collectors |
| 2,042,783 | Jun. 02, 1936 | E.A. Hall | Adjusting Means for Sleeve Bearings | industrial machine bearings |
| 2,092,117 | Sep. 07, 1937 | E.A. Hall | Valve Facing Means | valve reseating machines |
| 2,116,498 | May 10, 1938 | E.A. Hall | Grinding Machine | valve grinding tools |
| CA-378,556 | Dec. 27, 1938 | E.A. Hall | Grinding Machine | valve and seat maintenance |
| 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 | E.A. Hall, K.R. Bohn | Valve Grinding Machine | valve grinding tools |
