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'Rotary' can refer to:

★ Rotary engine, a type of internal combustion engine from the early 20th century

★ Rotary Woofer, a type of loudspeaker capable of very low frequency sound

★ Rotary International, a service organization

★ Rotary milking shed

★ Rotary dial, a rotating telephone dial

★ Roundabout, a road junction at which traffic streams around a central island

★ An abbreviation for Rotary tiller