Modern automatic electrically controlled elevators for transporting men at two coal mines in western Pennsylvania
By: by J. W. Holcomb.
Contributors: United States. Bureau of Mines.
Series: Information circular (United States. Bureau of Mines) -- 7628
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1952
Place of publication: Washington, DC
Language: eng
Notes: 1