In 1872, American inventor James Wayland patented a novel way of securing elevator shafts with doors which might be mechanically opened and shut since the elevator car approaches and leaves them.[sixteen] They are typically run by electric powered motors that generate traction cables and counterweight systems such as a hoist, https://holdensahm29629.qowap.com/92094164/maximizing-space-and-efficiency-with-attic-storage-lifts