| All Patents in class 403/327 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 139,174 | May 20, 1873 | F.H. Merrill | Improved Pipe Tongs | pipe tongs |
| 527,064 | Oct. 09, 1894 | M.C. Johnson | Driving-clutch | metal lathes |
| 705,403 | Jul. 22, 1902 | M.C. Hooker, C.L. Hooker | Separable Square | carpenter squares |
| 810,230 | Jan. 16, 1906 | W.B. Swan | Bit-Extender | drill bit extensions |
| 1,425,440 | Aug. 08, 1922 | R.F. Morgan, W.C. Beiswinger | Electrode Holder | welding |
| 1,533,281 | Apr. 14, 1925 | H.E. Tautz | Testing machine | |
| 1,954,048 | Apr. 10, 1934 | S.C. Moon, R.K. Jeffery | Tool Holder | drilling and boring tool holders |
| 2,194,085 | Mar. 19, 1940 | J.E. Hastings | Rule Clamp | rule accessories |
| 2,651,108 | Sep. 08, 1953 | J.B. Weems | Blade and Tool Holder | tool holders |
| 2,726,091 | Dec. 06, 1955 | L.P. Topar | Tool Holder | tool holders |
| 6,276,864 | Aug. 21, 2001 | D. Sola, D. Russo | Assembly for Connecting a Measuring Tool to a Measuring Head Moved by a Measuring Robot | |
