(1):
A screw link, to which is attached the rope of a rope-drilling apparatus, for feeding and slightly turning the drill jar at each stroke.
(2):
A set screw used for adjusting.
(1):
A screw link, to which is attached the rope of a rope-drilling apparatus, for feeding and slightly turning the drill jar at each stroke.
(2):
A set screw used for adjusting.
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