U.S. Commerce Dept. @CommerceGov
RT @uspto: #TDIH, #inventor George F. Ballou received a #patent for a pencil sharpening machine in 1896. https://t.co/UFouE93nJB — PolitiTweet.org
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Fri Mar 17 18:01:14 +0000 2017
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U.S. Commerce Dept. @CommerceGov
RT @uspto: #TDIH, #inventor George F. Ballou received a #patent for a pencil sharpening machine in 1896. https://t.co/UFouE93nJB — PolitiTweet.org