Ajit Pai @AjitPai
“Revolving Stairs”: OTD in 1859, @USPTO granted to Nathan Ames Patent No. 25,076. The object of his invention was “to enable persons to ascend and descend from one story of a building to another, without exerting any muscular strength.” It was the 1st appearance of the escalator. https://t.co/g88GuPgwWr — PolitiTweet.org