7 TORQUE TRANSMITTING COUPLINGS FOR MACHINES, FLUID MEDIUM TORQUE TRANSMITTING COUPLINGS FOR MACHINES; PARTS FOR SUCH COUPLINGS, NAMELY, HOUSINGS, DISCS AND PLATES; LIMITED SLIP DIFFERENTIALS FOR MACHINES; FLUID COUPLING LIMITED SLIP DIFFERENTIALS; PARTS FOR SUCH DIFFERENTIALS, NAMELY, HOUSINGS, GEAR WHEELS, BEARINGS AND SEALS