| All Patents in class 219/149 |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 438,406 | Oct. 14, 1890 | M.W. Dewey | Method of Utilizing Electricity in the Forming of Sheet Metal Articles | sheet metal bending machines |
| 438,407 | Oct. 14, 1890 | M.W. Dewey | Apparatus for Forming or Shaping Sheet Metal Electrically | sheet metal bending machines |
| 501,547 | Jul. 18, 1893 | E. Thomson | Shaping and Spinning Metals by Electricity | electrical discharge machining |
| 1,251,578 | Jan. 01, 1918 | W.E. Riecken | Shaping Machine | |
| 2,372,605 | Mar. 27, 1945 | W.F. Ross | Method and Apparatus for Making Solid Objects From Metal Powder | powdered metal apparatus |
