| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for William Ralph Ballantine | |||||
      | |||||
| Number | Date | Patentee | Title | Type | |
| CA-148,160 | May 27, 1913 | J.C. McLachlan, W.R. Ballantine | Rotary valve for engines | internal combustion engine valves | |