US2005758A - Crusher - Google Patents
US2005758A US629684A US62968432A US2005758A US 2005758 A US2005758 A US 2005758A US 629684 A US629684 A US 629684A US 62968432 A US62968432 A US 62968432A US 2005758 A US2005758 A US 2005758A Authority US United States Prior art keywords roll crushing conveyor roller coal Prior art date Legal status (The legal …