26 "GO" AND "NOT GO" SIZING DEVICES FOR CHECKING TOLERANCES-NAMELY, CYLINDRICAL PLUG GAGES, CONICAL PLUG GAGES, DOUBLE END PLUG GAGES, THREAD PLUG GAGES, PLAIN RING GAGES, CONE RING GAGES, PIPE RING GAGES, MEASURING WIRES, AND HANDLES, GUARDS AND BUSHINGS OF KINDS USED IN OR FOR GAGES