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anneau de garde
commun.	lip ring
comp.	protection ring (in a tape reel); isolation barrier
construct.	guard hoop
earth.sc., tech.	guard ring
el.	annular guard ring; guard-ring
pwr.lines.	arcing ring
радиоакт.	guard ring (of an ionization chamber or counter tube)

anneau de garde: 15 phrases in 4 subjects

Communications	8
Electronics	4
Metallurgy	1
Nuclear physics	2