US3168464A - Permanent magnetic separator - Google Patents
US3168464A US156774A US15677461A US3168464A US 3168464 A US3168464 A US 3168464A US 156774 A US156774 A US 156774A US 15677461 A US15677461 A US 15677461A US 3168464 A US3168464 A US 3168464A Authority US United States Prior art keywords magnetic plate units magnetizable shell Prior art date 1961-12-04 Legal status (The