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| All Patents in class 219/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 416,873 | Dec. 10, 1889 | B.C. Tilghman | Cutting Metals by Electricity | electrical discharge machining | |
| 1,382,852 | Jun. 28, 1921 | E.W. Pittman | Method and apparatus for finishing gunstocks | gunsmith | |
| 2,027,416 | Jan. 14, 1936 | J.r. Blakeslee | Electric Heating Apparatus | heating apparatus | |
| 2,138,811 | Dec. 06, 1938 | P.A. Abe | Surface Hardening Lathe Bed | flame hardening machines | |
| 2,321,174 | Jun. 08, 1943 | O. Bergstrom | Means of fabricating wall sections and the like | ||