Abstract: The specification discloses a monoclonal antibody capable of distinguishing human hepato-carcinoma cells, a hybridoma producing said monoclonal antibody and a process for preparing the monoclonal antibody using said hybridoma. The monoclonal antibody of the invention specifically attackes hepato-carcinoma cells in vivo.

Abstract: An antiskid pressure reducing device for a vehicle which lowers braking pressure to prevent wheels of the vehicle from coming into a locked state during brake application to the vehicle. A plunger, which moves back and forth as differential pressure between a high pressure chamber and a low pressure chamber increases or decreases, is arranged to slide to some extent within a cylinder during brake application which is frequently performed so that the plunger can be prevented from being stuck to the cylinder by rust to keep it unfailingly slidable for antiskid pressure reducing operations.