| Patents for Frank Armstrong |
Patents 1 -
10
of 18
      |
| Picture | Number | Date | Patentee | Title |
| | 212,413 | Feb. 18, 1879 | J.H. Vinton | Lathe-Chuck |
 | 221,633 | Nov. 11, 1879 | J.H. Vinton | Pipe-Wrench |
| | 233,821 | Oct. 26, 1880 | J.H. Vinton | Machine for Cutting Screw Threads |
| | 263,001 | Aug. 22, 1882 | J.H. Vinton | Machine for Cutting Screw Threads |
 | 268,978 | Dec. 12, 1882 | F. Armstrong | Tap Wrench |
 | 269,141 | Dec. 12, 1882 | N.W. Vandegrift | Pipe Vise |
| | 269,153 | Dec. 12, 1882 | F. Armstrong | Thread Cutting Die |
 | 274,544 | Mar. 27, 1883 | F. Armstrong | Wrench |
 | 274,545 | Mar. 27, 1883 | J.H. Hine, F. Armstrong | Wrench |
 | 291,266 | Jan. 01, 1884 | N.W. Vandegrift, F. Armstrong | Pipe Wrench |
