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| All Patents in class 181/200 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,583,238 | Jan. 22, 1952 | D.E. Sutton | Sound silencing means for circular saws | ||
| 3,741,335 | Jun. 26, 1973 | R.D. Lebeau | Sound reducing unit for machinery | ||