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spark gap ['spɑ:kgæp]
gen.	火花間げき (ひばな・かんげき) Engineering and Science Technical Dictionary (James Friend)
phys.	火花ギャップ (hibana-gyappu)
spark-gap
el.mach.	スパークギャップ

spark gap : 4 phrases in 3 subjects

Electricity generation	1
Electronics	1
Physics	2