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| All Patents in class 219/242 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 724,721 | Apr. 07, 1903 | M. Loewenthal | Electric Tool Holder | ||
 | 1,758,775 | May 13, 1930 | C.C. Abbot | Heat Dissipating Device | |