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| All Patents in class 188/281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 350,954 | Oct. 19, 1886 | N. Tesla | Regulator for Dynamo-Electric Machines | ||
| 1,609,843 | Dec. 07, 1926 | E.B. Stimpson | Noise eliminator for machines | lever presses | |
| 1,870,428 | Aug. 09, 1932 | E.B. Stimpson | Noise eliminator | riveting machines | |