US2297782A - Crushing machine - Google Patents
US2297782A US340164A US34016440A US2297782A US 2297782 A US2297782 A US 2297782A US 340164 A US340164 A US 340164A US 34016440 A US34016440 A US 34016440A US 2297782 A US2297782 A US 2297782A Authority US United States Prior art keywords roll plate teeth crushing roller Prior art date Legal status (The legal status is an assumption and is not a legal …