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On October 8, 1840, Mason's greatest invention, the "self-acting mule" was patented. Competition required improvements and on October 3, 1846, he received a patent for "Mason's Self-acting Mule."
However, at Spinning mule#Roberts' self-acting mule, we find that Richard Roberts had priority, his patent being granted in 1825. --Redrose64 🌹 (talk) 20:10, 21 June 2018 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2018-06-21T20:10:00.000Z","author":"Redrose64","type":"comment","level":1,"id":"c-Redrose64-2018-06-21T20:10:00.000Z-Self-acting_mule","replies":[]}}-->
