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| All Patents in class 181/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,865,677 | Jul. 05, 1932 | C.C. Cheyney | Sound deadener | ||
| 2,056,517 | Oct. 06, 1936 | B.M. Guthrie | Fan or Blower | fans and blowers | |
| 2,678,637 | May 18, 1954 | R.E. Doeden | Pneumatic tool construction | ||