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| All Patents in class 68/228 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,835 | Oct. 30, 1849 | O. Rice | Improvement in wash-boards | washing machines | |
| 20,473 | Jun. 08, 1858 | S.M. Barrett, J.M. Waters, R.S. Lee | Washboard | ||