age ~86
from Green Bay, WI
Mary Walton was an American independent inventor who worked in the late 19th century. In 1879, Walton created a method for reducing the environmental ...
where she lived near the IRT Sixth Avenue Line.
The rights to her invention, patented in 1881, were sold to the Metropolitan Railroad for $10, 000 and the system was soon adopted by other elevated railway companies.
Inventor