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| Patents for John B. Elfring | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,729,286 | Sep. 24, 1929 | J.B. Elfring | Adjustable Spacing Collar for Milling Cutters | ||
 | 1,799,739 | Apr. 07, 1931 | J.B. Elfring, C.G. Schiele | Precision measuring device | |