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sight glass
agric.	indicateur de niveau
chem.	trou de tête
earth.sc., mech.eng.	voyant m
food.ind.	viseur m; jauge visuelle du gobelet
IT, transp.	indicateur visuel de niveau
tech., mech.eng.	niveau visible
transp.	regard m
sight-glass
transp., chem.	regard en verre; regard à glace

sight glass: 16 phrases in 4 subjects

Agriculture	1
Food industry	3
Mechanic engineering	11
Technology	1