| Patents Granted on 1881-04-12 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| RE9,657 | Apr. 12, 1881 | C.W. Hubbard | Saw | sawblades |
| 239,933 | Apr. 12, 1881 | T.F. Carver | Friction-clutch | industrial machine clutches |
| 239,945 | Apr. 12, 1881 | E. Elliott | Tool Rest | lathe tool holders and tool posts |
| 239,969 | Apr. 12, 1881 | J.B. Matthews | Feed Motion for Metal Planing Machines | metalworking machine mechanisms |
| 239,972 | Apr. 12, 1881 | J.A. Miller | Reducing Socket Ratchet Nut Wrench | ratchet wrenches |
| 240,031 | Apr. 12, 1881 | W.J. Liddell | Straw-burning furnace | industrial furnaces |
| 240,048 | Apr. 12, 1881 | H.F. Snyder | Machine for sawing shingles | shingle machines |
| 240,067 | Apr. 12, 1881 | D. Worden | Pipe Tongs | pipe tongs |
| 240,076 | Apr. 12, 1881 | L. Bauer | Spokeshave | spokeshaves |
| 240,145 | Apr. 12, 1881 | C.F. Weber, F. Baier, I.F. Kearns | Spinning Lathe | metal spinning machines |
| 240,179 | Apr. 12, 1881 | J.L. Perry | Sanding machine | sanding machines |
