| All Patents in class 409/307 |
Patents 16 -
30
of 32
      |
| Number | Date | Patentee | Title | Type |
| 404,679 | Jun. 04, 1889 | T.W. Broomell | Machine for Cutting Key Seats | key seating machines |
| 406,525 | Jul. 09, 1889 | A.M. Little, O.C. Little | Key Seat Cutting Machine | key seating machines |
| 416,479 | Dec. 03, 1889 | G.W. Marshall | Combined Key Seat and Key Cutting Machine | key seating machines |
| 468,072 | Feb. 02, 1892 | M. Morton | Key Seat Cutting Machine | key seating machines |
| 477,737 | Jun. 28, 1892 | L.H. Colburn | Slotting Machine | key seating machines |
| 518,023 | Apr. 10, 1894 | W.P. Davis | Key Seating Machine | key seating machines |
| 540,095 | May 28, 1895 | A. Britt, A. Giesler | Splining Machine | metalworking machines |
| 589,010 | Aug. 31, 1897 | W. Merrill | Key-seat-cutting machine | key seating machines |
| 599,054 | Feb. 15, 1898 | L.H. Colburn | Machine for Cutting Slots | key seating machines |
| 618,894 | Feb. 07, 1899 | M. Morton, H.E. Morton | Key-seat-cutting machine | key seating machines |
| 748,844 | Jan. 05, 1904 | L.H. Colburn | Slotting Machine | key seating machines |
| 958,081 | May 17, 1910 | W. Billing | Key Seating Machine | key seating machines |
| 1,025,152 | May 07, 1912 | P.S. Mitts | Oil Groove Cutting Attachment for Key Seating Machines | key seating machines |
| 1,675,136 | Jun. 26, 1928 | E.P. Sacrey | Machine for Cutting Oil Grooves | oil grooving machines |
| 2,084,061 | Jun. 15, 1937 | H.E. Morton | Keyway Forming Machine | metal shapers |
