A
HUMAN NECESSITIES
A
HUMAN NECESSITIES
B
PERFORMING OPERATIONS; TRANSPORTING
B
PERFORMING OPERATIONS; TRANSPORTING
C
CHEMISTRY; METALLURGY
C
CHEMISTRY; METALLURGY
D
TEXTILES; PAPER
D
TEXTILES; PAPER
E
FIXED CONSTRUCTIONS
E
FIXED CONSTRUCTIONS
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
G
PHYSICS
G
PHYSICS
H
ELECTRICITY
H
ELECTRICITY
Y
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
Y
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