improved design, should make it popular with overseas buyers. A model shown at the recent Canadian International Trade Fair attracted considerable attention. There are several variations of the 'Sealion' and full details can be obtained from the manufacturers, Submarine Products Limited, 32 Printing House, Duddell Street, Hong Kong." This is the first known reference to either the "Sealion" regulator or the "Submarine Products" company. The "British engineer" in the article was presumably Hugh Oswell. 1957. May: An advertisement appears in the British Sub-Aqua Club journal Triton, describing Hugh Oswell’s "Sealion" regulator as "widely popular in Australia because of these outstanding features: Simplicity - only 4 moving parts; Safety - 2-way mouthpiece valves fitted in Super-flex spiral breathing tubes; Efficiency - Built-in reserve". According to the 1957 underwater catalogue of the London sporting goods store Lillywhites and the CG-45.com double-hose regulator collection website, at least 500 Sealion Mark I regulators were imported to Australia by Bob Wallace-Mitchell of Melbourne, a keen Victorian spearfisherman and distributor of Porpoise diving equipment for Ted Eldred, who designed the world's first single-hose regulator. In this May 1957 Triton advertisement, Andrews & Dalton of 126 Hanworth Road in Hounslow, Middlesex offers the Sealion regulator complete with cylinder and harness at £22 10s 0d. July: J. G. Fenn Ltd. of Stoke on Trent charges the same amount for this kit while pricing Typhoon, Siebe Gorman and Heinke scuba sets at £26 12s 6d, £40 and £42 respectively. 1958. September: Operating from Andrews & Dalton’s Hounslow address, Underwater Sports Ltd launches Mark II "Sealion Aqualung" incorporating "a yoke fitting for standard cylinders, pressure gauge take-off and peripheral holes for easier exhalation". 1959. July: Submarine Products Ltd., "makers of 'Sealion' diving equipment", which now trades from Andrews & Dalton’s Hounslow address, introduces the "Aquamobile" underwater scooter "powered by an ordinary 12-volt car battery". September: Submarine Products Ltd. represents French diving equipment manufacturer Beuchat of Marseilles as "sole agent" within Britain for Tarzan double-skinned isoprene wetsuits, which "are standard equipment with the French Navy". November: Submarine Products Ltd. moves to Acomb House in Hexham, Northumberland. 1960s 1960. March: Submarine Products offers "a complete range of equipment for the discerning diver", namely Sealion breathing apparatus with the Mark III regulator, Tarzan suits, fins, knives, masks, spearguns and the Aquamobile, "the world’s finest water scooter". May: The company launches the Sealion Atlantic scuba set "incorporating the revolutionary Venturi action in the mouthpiece