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Patents for Stanley P. Rockwell | |||||
Number | Date | Patentee | Title | Type | |
1,516,207 | Nov. 18, 1924 | S.P. Rockwell | Hardness-testing machine | metal hardness testers | |
1,516,208 | Nov. 18, 1924 | S.P. Rockwell | Hardness-testing machine | metal hardness testers |