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All Patents in class 172/41 | |||||
Number | Date | Patentee | Title | Type | |
2,214,142 | Sep. 10, 1940 | A.W. Mall | Vibrator | ||
2,774,292 | Dec. 18, 1956 | E. Hartmann | Earth conditioning device | ||
2,897,902 | Aug. 04, 1959 | A.N. Emmons | Power operated orbital motion tool |