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czas powrotu
math.	return period; return time
radiol.	recovery time
weld.	reset time
czas powrotu układu SPZ
el., sec.sys.	reclaim time
czas powrotu przekaźników pośredniczących
PSP	release time for elementary relays

czas powrotu: 5 phrases in 2 subjects

Mathematics	1
Power system protection	4