505 / | HD | SUPERCONDUCTOR TECHNOLOGY: APPARATUS, MATERIAL, PROCESS |
300 | DF | PROCESSES OF PRODUCING OR TREATING HIGH TEMPERATURE (Tc GREATER THAN 30 K) SUPERCONDUCTOR MATERIAL OR SUPERCONDUCTOR CONTAINING PRODUCTS OR PRECURSORS THEREOF {24} |
450 | DF | .~ With melting {2} |
451 | .~.~ With zone melting, zone solidification, or seed pulling |