| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents for John B. Elfring | |||||
      | |||||
| Number | Date | Patentee | Title | Type | |
| 1,729,286 | Sep. 24, 1929 | J.B. Elfring | Adjustable Spacing Collar for Milling Cutters | milling machines | |
| 1,799,739 | Apr. 07, 1931 | J.B. Elfring, C.G. Schiele | Precision measuring device | measuring tools | |