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| All Patents in class 366/123 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,073,393 | Mar. 09, 1937 | A.W. Mall | Vibrator for concrete work | ||
| 2,116,708 | May 10, 1938 | R.A. Niekamp | Apparatus for compacting concrete | ||
| 2,148,765 | Feb. 28, 1939 | A.W. Mall | Mass and form vibrator | ||
| 2,259,113 | Oct. 14, 1941 | A.W. Mall | Rotor for concrete vibrators | ||
| 2,295,283 | Sep. 08, 1942 | A.W. Mall | Rotor for vibrating devices | ||