
U.S. Commerce Dept. @CommerceGov
RT @uspto: @Zippo The patent for @Sikorsky's helicopter rotor control issued in 1950. The company is based in Stratford, Connecticut. #Madβ¦ — PolitiTweet.org
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Wed Jul 17 16:26:44 +0000 2019
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RT @uspto: @Zippo The patent for @Sikorsky's helicopter rotor control issued in 1950. The company is based in Stratford, Connecticut. #Madβ¦ — PolitiTweet.org