conical drum hoist

double drum hoist

double-drum hoist

Hoist drum

large hoist drum with inner ribs

three drum hoist

two drum hoist

two-drum hoist

double drum air driven hoist

double drum scraper hoist

cutting drum of coal drum shearer

Transferring drum and rubbing drum

Turning drum and twisting drum mechanism

3-drum building machine

6-face Rotating Drum

A Brief Analysis of Zhao Ji’s Snare Drum Works

a drum-shaped rattle

a new eight-corner drum mixing device

a small drum for marking time