Title:
Mine roof supporting structure
United States Patent 3240021


Inventors:
Michel, Meriaux
Michel, Lablache-combier
Application Number:
US21134462A
Publication Date:
03/15/1966
Filing Date:
07/20/1962
Assignee:
Mines, Domanlales Potasse DE. D.
Primary Class:
Other Classes:
52/632, 248/354.1, 405/297
International Classes:
E21D17/02; E21D17/08; E21D17/082; E21D23/06
View Patent Images:
US Patent References:
3127748Mine roof supports1964-04-07
Foreign References:
FR1192849A1959-10-28
FR1245142A1960-11-04
DE1077618B1960-03-17
GB823586A1959-11-11