Method and apparatus for scanning and monitoring the roof of seams mined by cutting machines
United States Patent 3371964
Inventors:
Karl-heinz, Weber
Publication Date:
03/05/1968
Assignee:
Eickhoff, Maschf Eisen
International Classes:
E21C27/02; E21C35/04; E21C35/10; E21C35/24; E21C27/00; E21C35/00