Steel bushed rollerless chains , attachments and sprockets .

工程用钢制套筒链、附件及链轮。

Agricultural , detachable , and pintle chains , attachments , and sprockets .

农用可拆卸和斜栓节链附件和供片轮。

Film perforation : hole punched at regular intervals for the length of film , intended to be engaged by pins , pegs , and sprockets as the film is transported through the camera , projector , or other equipment .

片孔：在胶片长度方向上按一定间隔打出的孔，这样当胶片通过摄影机、放映机或其它设备时，就可以被定位针、钉和扣片齿轮固定。

There were five different 16-tooth sprockets .

有5个不同的16齿链轮。

Loosen camshaft controllers and sprockets on the four camshafts by 2 turns .

将四个凸轮轴上的凸轮轴控制器和链轮松开两圈。