| All Patents in class 408/47 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 3,151X | Dec. 21, 1819 | J. Corbett | Machine for boring holes in posts |
 | 121,074 | Nov. 21, 1871 | F.S. Allen, C.F. Ritchel | Improvement in boring-machines |
 | RE5,222 | Jan. 07, 1873 | N.R. Merchant | Improvement in boring-machines |
 | 147,339 | Feb. 10, 1874 | G.W. McCready | Improvement in boring-machines |
 | 421,517 | Feb. 18, 1890 | F.H. Richards | Drilling Machine |
 | 552,379 | Dec. 31, 1895 | A.J. Langelier | Multiple drill |
| | 2,522,736 | Sep. 19, 1950 | F.G. Zagar | Parallel motion multiple spindle head |
