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In page Aqua-Lung:

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In the United States, U.S. Divers managed to keep "Aqualung" as a trademark. The acronym "SCUBA", or "Self Contained Underwater Breathing Apparatus", originated in the United States Navy, where it referred to a frogman's oxygen rebreather designed by Christian J. Lambertsen. SCUBA became the generic term for any type of self-contained breathing set for diving, and soon the acronym SCUBA became a common noun – "scuba" – all in lower-case. "Scuba" was a trademark for a time – used by Healthways, now known as Scubapro – one of the competitors of U.S. Divers.[citation needed]