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| Patents for Hugh M. Rockwell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,294,171 | Feb. 11, 1919 | S.P. Rockwell, H.M. Rockwell | Hardness-tester | ||
| 1,415,054 | May 09, 1922 | H.M. Rockwell | Gauge | ||
| 1,543,795 | Jun. 30, 1925 | H.M. Rockwell | Continuous Reading Gauge | ||