Search results for IPC class: E21D19/02
IPC class description: E21D19/02
E
:
SECTION E FIXED CONSTRUCTIONS
E21
:
EARTH OR ROCK DRILLING; MINING
E21D
:
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D19/00
:
Provisional protective covers for working space
E21D19/02
:
.
for use in longwall working
Top 20 Assignees for IPC class: E21D19/02
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