00643nam0 2200217 450 00000961120180628105722.020080410d1961----km-y0itay50------baengrusGBa-------001-yTime relaysby G. V. Druzhinintranslated from Russian by John YeomanOxford [etc.]Pergamon press1961X, 80 p.ill.21 cm681.1120Druzhinin,G. V.630845ITUNIPARTHENOPE20080410RICAUNIMARC000009611681.11/10114754PISTTime relays1205220UNIPARTHENOPE