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| All Patents in class 138/124 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,022,943 | Apr. 09, 1912 | A.P. Hinsky | Conduit | ||
| 1,284,956 | Nov. 12, 1918 | G.W. Emrick | Flexible conduit | ||
| 1,285,138 | Nov. 19, 1918 | H. Hansen | Flexible electrical conduit | ||