| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for William W. Duffield | |||||
      | |||||
| Picture | Number | Date | Patentee | Title | |
 | 157,989 | Dec. 22, 1874 | W.W. Duffield | Improvement in sawing-machines | |
| 407,515 | Jul. 23, 1889 | W.W. Duffield | Draftsman's Protractor | ||