| All Patents in class 408/83 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 124,230 | Mar. 05, 1872 | C.H. Thompson | Improvement in machines for cutting square mortises |
 | 1,868,440 | Jul. 19, 1932 | E.A. Arp | Boring machine and method |
 | 1,954,034 | Apr. 10, 1934 | E.A. Arp | Equalizing boring guide |
| | 2,189,604 | Feb. 06, 1940 | F.P. Healy | Boring bar guiding mechanism |
| | 2,196,827 | Apr. 09, 1940 | F.P. Healy | Tool guide for boring machines |
| | 2,207,861 | Jul. 16, 1940 | F.P. Healy | Boring bar guiding mechanism |
| | 2,273,258 | Feb. 17, 1942 | W.L. Groene | Boring Tool Holder |
| | 2,416,996 | Mar. 04, 1947 | E.A. Allen, F.P. Healy | Boring bar guiding mechanism |
| | 3,099,174 | Jul. 30, 1963 | S.A. Cogsdill | Countersinking Tool |
| | 3,348,434 | Oct. 24, 1967 | H.R. Plummer | Boring Bar Assembly for Deep Hole Boring |
