| Patents Granted on 1931-09-__ |
Patents 1 -
15
of 42
      |
| Number | Date | Patentee | Title | Type |
| 1,821,113 | Sep. 01, 1931 | W.S. Neighbour | Mounting for rotary miter saws | tablesaws |
| 1,821,194 | Sep. 01, 1931 | G.R. Wilcox | Automatic screw driver | spiral screwdrivers |
| 1,821,216 | Sep. 01, 1931 | F.G. Hobart, W.C. Heath | Pump | pumps |
| 1,821,218 | Sep. 01, 1931 | F.G. Hobart | Pump and Method of Pump Construction and Operation | reciprocating pumps |
| 1,821,331 | Sep. 01, 1931 | E.J. Svenson | Tailstock | |
| 1,821,398 | Sep. 01, 1931 | R.J. Simpson | Micrometer Calipers | micrometers |
| 1,821,436 | Sep. 01, 1931 | J.J. Holloway | Portable power driven tool | handheld power drills |
| 1,821,569 | Sep. 01, 1931 | C.B. Nelson | Sawing-trimming machine | tablesaws |
| 1,821,624 | Sep. 01, 1931 | A.N. Emmons | Sandpapering machine | handheld power sanders |
| 1,821,841 | Sep. 01, 1931 | G.O. Leopold | Spiral screw driver | spiral screwdrivers |
| GB-356,242 | Sep. 02, 1931 | n. listed | Improvements in or Relating to Centerless Grinding Machines | grinding machines |
| 1,822,070 | Sep. 08, 1931 | C. Vallone | Holder for Tools or Implements | tool holders |
| 1,822,337 | Sep. 08, 1931 | J.E. Caster | Grinding Machinery | grinding machines |
| 1,822,348 | Sep. 08, 1931 | C.W. Hopkins | Grinding Machine | grinding machines |
| 1,822,413 | Sep. 08, 1931 | W.E. Favini, A.D. Mizzy | Micrometer | micrometers |
