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| All Patents in class 177/38 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,993,577 | Mar. 05, 1935 | E.J. Von Pein | Low drum scale | ||
| 2,013,592 | Sep. 03, 1935 | E.A. Reussenzehn, E.J. Von Pein | Drum scale | ||