File:Lever switch of air vent valve Wheatstone English concertina.jpg
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![File:Lever switch of air vent valve Wheatstone English concertina.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Lever_switch_of_air_vent_valve_Wheatstone_English_concertina.jpg/754px-Lever_switch_of_air_vent_valve_Wheatstone_English_concertina.jpg?20181119164021)
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