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котельный камень stresses
auto.	furring
chem.	scale deposit
construct.	scale incrustation
dril.	scale
food.ind.	boiler scale
mech.eng., obs.	scales
nautic.	furr; incrustant
railw.	scale crust; sediment incrustation
tech.	incrustation; fur (в котле)

котельный камень: 7 phrases in 4 subjects

Geology	1
Mechanic engineering	2
Rail transport	1
Shipbuilding	3