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| All Patents in class 73/798 | |||||
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| Number | Date | Patentee | Title | Type | |
| 278,914 | Jun. 05, 1883 | A.H. Emery | Machinery for testing the strength of metal | testing machines | |
| 278,915 | Jun. 05, 1883 | A.H. Emery | Tensile and compressive strength tester | testing machines | |
| 278,919 | Jun. 05, 1883 | C.E. Emery | Hydraulic testing-machine | testing machines | |