电锤

rotary haymaker (rotary-drum rake and tedder) haymaking (haying)

rotary drill bit (rotary boring head) deep drilling

flexible drive mechanism for interconverting rotary motion and oscillating motion

rotary tippler【矿】

rotary anemometer【气象】

rotary roughening【机】

rotary machinery

rotary-drum furnace, revolving melting furnace, revolving reverberatory furnace