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Patents for Raymond O. Stetson | |||||
Number | Date | Patentee | Title | Type | |
794,753 | Jul. 18, 1905 | R.O. Stetson | Illuminated Spirit-Level | levels | |
1,752,112 | Mar. 25, 1930 | R.O. Stetson, C.D. Severance | Spirit level | levels |