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| Patents Granted on 1931-11-10 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,830,813 | Nov. 10, 1931 | H.E. Tautz | Cutter head | cutterheads | |
| 1,831,172 | Nov. 10, 1931 | E.A. Hall | Cylinder Hone | honing tools | |
| 1,831,382 | Nov. 10, 1931 | E. Gairing | Full Floating Universal Tool Holder | drilling and boring tool holders | |
| 1,831,447 | Nov. 10, 1931 | R. Heinrich | Metal cutting instrument | metal shearing machines | |
| 1,831,681 | Nov. 10, 1931 | J. Miller | Edge trimming and mowing machine | lawn mowers | |
| 1,831,705 | Nov. 10, 1931 | S.T. Freas | Insertable Tooth Saw | ||