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1954 HOPE-PAGE ENGINEERING CORP. P. O. BOX 6541 LONG BEACH 15, CALIFORNIA Safety First Non - Return Mouthpiece SAVES AIR NO MORE NO MORE NO MORE because it allows the exchange of mouthpiece underwater Panic from losing mouthpiece Water filling hoses Gurglinq from water that seeps in around mouthpiece Parry says... "The Hope-Page Non-Return valve is a great and necessary addition to the already wonderful invention, the Aqua-Lung. I strongly urge every user to have one. I am proud to recommend it." Distributed through: Parry Bivens Research Engineer and Diver extra-ordinary 1045 Broxton Avenue U. S. DIVERS CORP. Los Angeles 24, California
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