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| All Patents in class 177/19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 17,230 | May 05, 1857 | R. Porter | Improvement in the buckets of automatic grain-weighing machines | grain scales | |
| RE516 | Dec. 22, 1857 | R. Porter | Improvement in automatic grain-weighing machines | grain scales | |
| 444,709 | Jan. 13, 1891 | T.L. Varns, J.B. Michener | Grain-meter | grain scales | |