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number of revolution
gear.tr.	Doppelhubzahl n
number of revolutions
chem.	Drehzahl f (UpM = Umdrehungen pro Minute, rpm = revolutions per minute)
nucl.phys.	Drehzahl f (revs); Umdrehungszahl f (revs)

number of revolution: 5 phrases in 4 subjects

General	1
Materials science	2
Mechanic engineering	1
Nuclear physics	1