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Gichtgas n -es, -e
gen.	furnace gas
construct.	blast-furnace gas
environ., met.	flue gas
industr.	fatal by-product gas; recovery gas
met.	top gas
nat.res.	furnace top gas
tech.	blast furnace gas

Gichtgas: 4 phrases in 3 subjects

Environment	1
Metallurgy	2
Natural resourses and wildlife conservation	1