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Schutzring m
chem.	bumper guard
comp.	protection ring (in a tape reel); isolation barrier
el.	annular guard ring; guard-ring
IT	file protection ring; write enable ring; write-protect
mech.eng.	protection ring
tech.	guard ring; protecting ring
transp.	excluder
радиоакт.	guard ring (of an ionization chamber or counter tube)

Schutzring: 3 phrases in 2 subjects

Microelectronics	2
Nuclear physics	1