If you're thinking, more like a tree-scraper, keep in mind that this was only about 30 years after Elisha Graves Otis invented his elevator safety system that made elevators more secure.
你是否把它想成一棵参天大树，请记住，家庭保险大楼建于以利沙·格拉夫·奥蒂斯发明了使电梯更加安全的电梯安全系统大约30年后。
Elisha Graves Otis
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Elisha Otis
（重定向自Elisha Graves Otis）
Elisha Graves Otis (August 3, 1811 – April 8, 1861) was an American industrialist, founder of the Otis Elevator Company, and inventor of a safety device that prevents elevators from falling if the hoisting cable fails. He worked on this device while living in Yonkers, New York in 1852, and had a finished product in 1854.
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