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| All Patents in class 373/130 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,692,478 | Nov. 20, 1928 | J. Weintz | Electric furnace | ||
| 1,692,479 | Nov. 20, 1928 | J. Weintz | Electric furnace | ||
| 1,762,201 | Jun. 10, 1930 | H.W. Strong | Electric furnace | ||