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reference substance
chem.	Eichstoff m; Eichsubstanz f
nat.res.	Kontrollsubstanz f
opt.	Reinsubstanz f
pharma., chem.	Bezugsstoff m; Bezugssubstanz f; Referenzstoff m; Referenzsubstanz f; Vergleichsstoff m; Vergleichssubstanz f

reference substance: 6 phrases in 3 subjects

Foreign trade	1
General	3
Technology	2