... three types of drawn pure and thoriated tungsten wire suitable for fabrication into parts for electron tubes, lamps, and other electron devices, ... and one type of rod for metal-to-glass sealing (grid wire is excepted): Type 1A, Type 1B, Type ... a clean finish, free of graphite, grease, oil, and lubricants. Wire for hooks, supports, springs, anchors, and mesh shall have a bright ...