Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
Inventor
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Protected lubricant reservoir for sealed bearing earth...
Protected lubricant reservoir for sealed earth boring drill bit
Protected lubricant reservoir with pressure control for...
Rock bit borhole back reaming method
Rock drill bit with back-reaming protection
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Profile ID: LFUS-PAI-P-191513