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| All Patents in class 219/156 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,016,369 | Oct. 08, 1935 | P.R. Hoopes | Machine for Electrically Heating Metal Articles | heating apparatus | |
| 2,052,761 | Sep. 01, 1936 | F.W. Gaines | Electrical Blank Heating Machine | heating apparatus | |