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All Patents in class 227/51 | |||||
Number | Date | Patentee | Title | Type | |
1,731,360 | Oct. 15, 1929 | E.B. Stimpson | Riveting machine | riveting machines | |
1,839,901 | Jan. 05, 1932 | E.B. Stimpson | Riveting machine | riveting machines |