| Patents Granted on 1931-08-11 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| CA-314,197 | Aug. 11, 1931 | A.A. Criqui | Centrifugal fan | |
| 1,817,910 | Aug. 11, 1931 | R.S. Brown | Chain mortiser | mortising machines |
| 1,817,944 | Aug. 11, 1931 | A. Rosner | Power Plant | power plants |
| 1,817,980 | Aug. 11, 1931 | J. Donnelly, H.S. Forsberg | Saw frame | frame saws |
| 1,818,077 | Aug. 11, 1931 | R.E. Manley, F.T. Flinchbaugh | Mechanical jack | vehicle mechanic |
| 1,818,089 | Aug. 11, 1931 | F.A. Parsons | Milling Machine Transmission | milling machines |
| 1,818,128 | Aug. 11, 1931 | W.F. Groene | Automatic lathe | automatic lathes |
| 1,818,305 | Aug. 11, 1931 | G.M. Class | Collet Chuck | metal lathe chucks |
| 1,818,465 | Aug. 11, 1931 | J.G. De Remer | Massage apparatus | exercise and sports equipment |
| 1,818,501 | Aug. 11, 1931 | E.A. Odin | Universal vise | bench vises |
| 1,818,611 | Aug. 11, 1931 | W. Ernst | Radial Pump | hydraulic pumps |
| 1,818,823 | Aug. 11, 1931 | A.L. Stowell | Brace Bit Extension | drill bit extensions |
| 1,818,869 | Aug. 11, 1931 | E.J. Reede | Tool | pliers |
