English translation: spring-loaded inertial mechanism
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Russian to English translations [PRO] Tech/Engineering / Roller shutter doors
Russian term or phrase:пружинно-инерционный механизь
It is the spring worked device which winds up a roller shutter (in windows of shops, etc.); you pull the shutter down against a spring, which then winds it up into a storage box. My first reaction is 'spring-inertial mechanism'