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| Patents for Standard Tool Co. (Athol) | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 54,503 | May 08, 1866 | O.R. Chaplin | Improvement in Combined Square and Bevel | |
 | RE9,183 | May 04, 1880 | O.R. Chaplin | Combined Square and Bevel | |
 | 228,437 | Jun. 08, 1880 | S.H. Bellows | Monkey Wrench | |
 | 295,100 | Mar. 11, 1884 | S.H. Bellows | Combined Bevel and T-Square | |
 | 427,956 | May 13, 1890 | S.H. Bellows | Beam Caliper | |
 | 582,517 | May 11, 1897 | S.H. Bellows | Shaft Level | |