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A METHOD OF SHAPING PROTRUSIONS,PARTICULARLY DRIVERS ONSTIRRUP YOKES OF MINING SUPPORTS,AND A MEANS OF SHAPING PROTRUSIONS,PARTICULARLY DRIVERS ON STIRRUP YOKES OF MINING SUPPORTS
A METHOD OF SHAPING PROTRUSIONS,PARTICULARLY DRIVERS ONSTIRRUP YOKES OF MINING SUPPORTS,AND A MEANS OF SHAPING PROTRUSIONS,PARTICULARLY DRIVERS ON STIRRUP YOKES OF MINING SUPPORTS