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