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| All Patents in class 177/188 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,167,204 | Jul. 25, 1939 | H.A. Hadley | Automatic Beam Stop | scales and balances | |
| 2,383,404 | Aug. 21, 1945 | K.C. Allen, D.A. Meeker | Scale | ||