US2987153A - Magnetic fluid seals in magnetic clutches ...
US2987153A US68733457A US2987153A US 2987153 A US2987153 A US 2987153A US 68733457 A US68733457 A US 68733457A US 2987153 A US2987153 A US 2987153A Authority US United States Prior art keywords magnetic clutch working gap fluid flux Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.