| Patents for Alexander F. Roberts |
Patents 46 -
60
of 72
      |
| Number | Date | Patentee | Title | Type |
| 95,060 | Sep. 21, 1869 | J. Winkelhouse | Improvement in bit-holder | brace chucks |
| 95,868 | Oct. 19, 1869 | J.F. Allen | Improvement in steam-engine slide-valves | steam engine valves |
| 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | sharpening apparatus |
| 99,600 | Feb. 08, 1870 | J.B. Schenck | Improvement in sawing-machines | circular resaws |
| 100,813 | Mar. 15, 1870 | J. Skipp | Improvement in mortising-machines | mortising machines |
| 101,548 | Apr. 05, 1870 | J.J. Urmston | Hub lathe | wood lathes |
| 101,982 | Apr. 19, 1870 | E.Y. Clark | Improvement in saw-sets | saw sets |
| 102,069 | Apr. 19, 1870 | J.R. van Epps | Improvement in dovetailing-machine | dovetailing machines |
| 102,286 | Apr. 26, 1870 | C.V. Littlepage | Improvement in saws | saw teeth |
| 102,597 | May 03, 1870 | H.A. Schneekloth | Foot-powered hoist | hoists, winches, come-alongs |
| 105,956 | Aug. 02, 1870 | J.K. Lake | Traction Engines | steam traction engines |
| RE4,419 | Jun. 13, 1871 | L.P. Bradley | Improvement in tape-measures | tape measures |
| 142,420 | Sep. 02, 1873 | J. Travers | Improvement in machines for making window-sash | window making machines |
| 153,985 | Aug. 11, 1874 | J.H. Sinkinson | Spool lathe | spool or bobbin machines |
| 154,880 | Sep. 08, 1874 | A.F. Marshall | Improvement in wood-bending machines | wood bending machines |
