| All Patents in class 29/DIG.67 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 194,962 | Sep. 11, 1877 | L. Field | Screw Cutting Machines | screw machines |
| 439,122 | Oct. 28, 1890 | L.B. Curtis | Pipe and Bolt Threading Attachment for Lathes | metal lathe accessories and attachments |
| 569,902 | Oct. 20, 1896 | F.E. Wells, W.C. Wells | Machine for Making Nipples | pipe making machines |
| 661,554 | Nov. 13, 1900 | J.E. Roberts | Rotary Cutter Head | drill bits |
| 2,175,347 | Oct. 10, 1939 | A.G. Ericson, B.R. Granberg | Cooling Device for Machine Tools | coolant apparatus |
| 2,377,271 | May 29, 1945 | R. Schümann | Flexible Shaft And Air-Cooled Hand Piece | handheld power tool accessories |
| 2,452,268 | Oct. 26, 1948 | R. Schümann | Motor Hand Tool Assembly | handheld grinders |
| 2,535,184 | Dec. 26, 1950 | J.C. Wilson | Method and Apparatus for Supplying Coolant to Grinding Wheels | coolant apparatus |
