| All Patents in class 451/324 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 5,385X | Mar. 03, 1829 | W. Robinson | Grinding steel dies used to make steel buttons | button making machinery |
| 119,282 | Sep. 26, 1871 | A. Saffer | Polishing Stone | polishing and buffing machinery |
| 189,483 | Apr. 10, 1877 | M.H. McNair | Devices for Fitting and Polishing Cylinders and Rings | mandrels and arbors |
| 295,705 | Mar. 25, 1884 | G.R. Williams | Button Machine | button making machinery |
| 348,146 | Aug. 24, 1886 | C.A. Artman | Broom-handle lathe | broom making machinery |
| 494,715 | Apr. 04, 1893 | I. Grasset | Device for Polishing Precious Stones | polishing and buffing machinery |
| 1,486,337 | Mar. 11, 1924 | W.E. Hoke | Machine for Making Gauges and Other Articles | lapping machines |
| 1,639,958 | Aug. 23, 1927 | C.H. Norton | Centerless Grinding Machine | grinding machines |
| 3,386,317 | Jun. 04, 1968 | R.C. Greathouse, C.N. Flick | Bore Machining Mechanism | horizontal boring mills |
