The invention relates to breathing apparatus, particularly of the open-circuit type, comprising a backpiece equipped with means, particularly involving straps, to allow it to be worn on the back of a wearer, the backpiece being intended to support at least one cylinder equipped with a valve, the backpiece...http://www.google.co.uk/patents/US7891357?utm_source=gb-gplus-sharePatent US7891357 - Breathing apparatus, particularly of the open-circuit type
