'Elisha Graves Otis invented the safety hoist, which we call this'
an elevator
INVENTIVE MINDS: Elisha Graves Otis invented the safety hoist, which we call this
Elisha Graves Otis invented the safety hoist, which we call this
Elisha Graves Otis invented the safety hoist, which we call this
INVENTIVE MINDS
an elevator
INVENTIVE MINDS