Elisha Otis' son Charles improved on the device that slowed a speeding this, whether or not the rope broke
... His sons Charles and Norton, who had worked with their father 
on his... [DOC] [TLE] Elisha Otis - Wikipedia [PAR] 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.