MRGRRBK
Mason & Co.
The Herrick automatic elevator safety : this safety is inoperative while the elevator moves at its regular speed ... -- [Boston : s.Nn., 1881. ]
[lJ p.. ¢ 22. em.
1. Elevators--Maintenance and repair. 2. Safety appliances. 3's Advertising flyers. I. Mason, V.W. & Co. It. Title.
& ocm28540129
002372