| All Patents in class 409/73 |
Patents 1 -
10
of 18
      |
| Picture | Number | Date | Patentee | Title |
 | 44,037 | Aug. 30, 1864 | A.R. Arnold | Improved machine for making twist-drills |
 | RE3,588 | Aug. 10, 1869 | A.R. Arnold | Improved machine for making twist-drills |
| | 191,826 | Jun. 12, 1877 | L. Bollmann | Machines for Cutting Screw Threads |
| | 230,825 | Aug. 03, 1880 | I.S. Schuyler | Machine for Cutting Screw Threads |
 | 381,092 | Apr. 10, 1888 | J. Swan | Machine for Grooving Bit-Blanks |
| | 543,486 | Jul. 30, 1895 | M.C. Johnson | Twist Drill Body Clearing Machine |
| | 643,991 | Feb. 20, 1900 | G.B. Taylor | Machine for Cutting Spiral End Helical Teeth in Chuck Jaws |
| | 1,047,280 | Dec. 17, 1912 | H.W. Oster | Thread-cutting mechanism |
 | 1,254,753 | Jan. 29, 1918 | C.H. Whipple | Machine for Manufacturing Twist Drills & Other Articles |
| | 1,278,867 | Sep. 17, 1918 | J.F. Daneke | Milling Machine Fixture |
