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oil film
chem.	Ölhäutchen n
mech.eng.	Ölhaut f
nat.res.	Ölfleck m; Ölschicht f; Ölteppich m
tech.	Ölfilm m; Schmierfilm m; Schmierschicht f

oil film: 8 phrases in 5 subjects

Ball bearings	1
Environment	1
General	4
Oils and lubricants	1
Optics branch of physics	1