一種組裝單元,由包含單列或多列滾珠軸承的外殼組成,設計用於滿足各種或特定的安裝條件。
door ay, shtr, uph lh;door ay, shrt lwr rh;door ay, shtr, lwr, lh;door assy, shrt, upr rh end item identification, inavy)bearing assy,eccentric;(drawing)torpedo tube rotary shutter door miscellaneous subassembly & details special features