| All Patents in class 148/642 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 1,333,767 | Mar. 16, 1920 | C. Napier | Method of making tempered blades |
 | 2,138,811 | Dec. 06, 1938 | P.A. Abe | Surface Hardening Lathe Bed |
 | 2,157,948 | May 09, 1939 | H.H. Beeny | Hardening of Metal Surfaces |
| | 2,245,273 | Jun. 10, 1941 | A.L. Hartley | Method of Flame Hardening Lathe Beds |
| | 2,312,839 | Mar. 02, 1943 | T.A. Waltz, A. Kullman | Flame Hardening Of Rack Bars |
 | 2,786,788 | Mar. 26, 1957 | W.T. Anderson | High speed tool steel saw band and method of making the same |
| | 2,867,556 | Jan. 06, 1959 | G.E. Tegen | Method of Flame Hardening |
