Zobe mai siffar U, galibi ana amfani dashi don ƙera tsarin hydraulic a cikin hatimin mai ramawa. An yi amfani da ko'ina a cikin hatimin silinda na silinda. O-zobe galibi ana amfani dashi don madaidaiciyar hatimi da ɗaukar nauyi. Lokacin da aka yi amfani dashi don hatimin Rotary Movement, an iyakance shi zuwa ƙananan ƙarfin juyawa na sauri ...
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