| All Patents in class 409/73 |
Patents 1 -
15
of 18
      |
| Number | Date | Patentee | Title | Type |
| 44,037 | Aug. 30, 1864 | A.R. Arnold | Improved machine for making twist-drills | tool making machines |
| RE3,588 | Aug. 10, 1869 | A.R. Arnold | Improved machine for making twist-drills | tool making machines |
| 191,826 | Jun. 12, 1877 | L. Bollmann | Machines for Cutting Screw Threads | metal threading machines |
| 230,825 | Aug. 03, 1880 | I.S. Schuyler | Machine for Cutting Screw Threads | metal threading machines |
| 381,092 | Apr. 10, 1888 | J. Swan | Machine for Grooving Bit-Blanks | making drills and augers |
| 543,486 | Jul. 30, 1895 | M.C. Johnson | Twist Drill Body Clearing Machine | making drills and augers |
| 643,991 | Feb. 20, 1900 | G.B. Taylor | Machine for Cutting Spiral End Helical Teeth in Chuck Jaws | gear making machines |
| 1,047,280 | Dec. 17, 1912 | H.W. Oster | Thread-cutting mechanism | pipe threading machines |
| 1,254,753 | Jan. 29, 1918 | C.H. Whipple | Machine for Manufacturing Twist Drills & Other Articles | making drills and augers |
| 1,278,867 | Sep. 17, 1918 | J.F. Daneke | Milling Machine Fixture | milling machine accessories |
| 1,279,041 | Sep. 17, 1918 | A.M. Thomson | Turning and Thread-Milling Machine | metal thread milling machines |
| 1,287,732 | Dec. 17, 1918 | F. Müller | Machine for Milling Knurls | embossing and knurling machines |
| 1,501,218 | Jul. 15, 1924 | J.S. Imlach | Pipe-threading machines | pipe threading machines |
| 1,501,252 | Jul. 15, 1924 | G.T. Trundle, Jr. | Thread Milling Machine | thread hobbing and thread milling machines |
| 1,774,692 | Sep. 02, 1930 | J.B. Armitage | Metal-Working Machine | milling machines |
