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Umpolung f
gen.	pole reversal; reversion; reversion of polarity; turn-over
accum.	cell reversal
earth.sc., el.	crossed connection
meas.inst.	pole reversal (reversion)
med.	pole change
phys.	polarity alternation; pole changing
tech.	plugging; polarity reversal; pole-changing; reversal

Umpolung: 3 phrases in 3 subjects

General	1
Metallurgy	1
Transport	1