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Quarzglas n -es
gen.	fused quartz; quartz glass
antenn., opt.	fused silica
el.	vitreous silica
industr., construct., chem.	transparent fused silica; transparent vitreous silica
opt.	fused quartz (silica)
tech.	silica glass

Quarzglas: 5 phrases in 2 subjects

Electronics	4
Optics branch of physics	1