| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for Corneil Ridderhof | |||||
      | |||||
| Number | Date | Patentee | Title | Type | |
| 691,488 | Jan. 21, 1902 | C. Ridderhof | Friction-clutch for counter-shafts | friction clutches | |
| 702,885 | Jun. 17, 1902 | C. Ridderhof | Drill-grinding machine | drill grinders | |
| 743,033 | Nov. 03, 1903 | C. Ridderhof | Drill-grinding machine | drill grinders | |
| 772,908 | Oct. 18, 1904 | G.E. Miles, C. Ridderhof | Flashing device for incandescent electric lamps | electrical devices | |
| 829,488 | Aug. 28, 1906 | C. Ridderhof | Mandrel-press | screw presses | |