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| All Patents in class 252/502 | |||||
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| Number | Date | Patentee | Title | Type | |
| 269,132 | Dec. 12, 1882 | W. Stanley, Jr. | Carbon filament produced from hair | electric arc lamps | |
| 323,372 | Jul. 28, 1885 | W. Stanley, Jr., E.P. Thopmson | Carbon for incandescent lamps | electric arc lamps | |