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| All Patents in class 408/704 | |||||
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| Number | Date | Patentee | Title | Type | |
| 493,191 | Mar. 07, 1893 | M.F. Smith | Machine for Finishing Bores of Large Gun Tubes or Cannon | cannons | |
| 1,506,331 | Aug. 26, 1924 | I. Benkö | Tool Holder | drilling and boring tool holders | |
| 2,320,333 | May 25, 1943 | H.C. Pierle | Gun boring tool | gunsmith | |