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| All Patents in class 73/847 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 278,914 | Jun. 05, 1883 | A.H. Emery | Machinery for testing the strength of metal | |
 | 278,918 | Jun. 05, 1883 | A.H. Emery | Machinery for testing the strength of metal | |