HUMAN NECESSITIES

PERFORMING OPERATIONS; TRANSPORTING

CHEMISTRY; METALLURGY

TEXTILES; PAPER

FIXED CONSTRUCTIONS

MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

PHYSICS

ELECTRICITY

GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS