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| All Patents in class 200/321 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,596,013 | Aug. 17, 1926 | J.J. Gebhardt | Control mechanism for electric tools | |
| 1,828,903 | Oct. 27, 1931 | W. Moretti | Electric tool | ||
 | 1,929,662 | Oct. 10, 1933 | F.W. Wappat | Motor driven tool switch | |