of gas masks including the British Civilian Duty Respirator (for Civil Defence & related use) and the Respirator, Anti-Gas, Civilian Duty (for general public use). May 1941: Siebe Gorman's factory in Lambeth was bombed during World War II. Massive loss of company and personal historical records. 1941: The company, already planning to leave London, moved to Chessington, Surrey and resumed manufacturing. It has been speculated (although without any real evidence) that André Rubber located to the same area in order to supply Siebe Gorman. June 1943: Siebe Gorman were contracted by the 79th Armoured Division (United Kingdom) to design specialist apparatus for use by the Duplex Drive Tank crews. Known as the Amphibious Tank Escape Apparatus (ATEA) the equipment was fitted with a protosorb canister and enabled it to be used as a re-breather for up to 7 minutes. Tank crews would strap the inflated ATEA to their chests, and in the event of sinking, would fit the mouth piece and nose clips. The equipment was used extensively in training, during which crews perfected its operation in a water-filled cistern as well as on a submerged tank. No doubt it contributed to the saving of many lives especially on D Day where 35% of the tanks that swam towards the Normandy shore sunk due to the poor sea conditions. 1200 men were trained before D Day using the ATEA, and a further 300 for River Crossing. After WWII 1948: Siebe Gorman was making aqualungs of the type nicknamed 'Tadpoles'. around 1950: Peak production of standard diving dress. After this, diving technological development in the USA more and more reduced Siebe Gorman's business, which was halved by the early 1960s. 1951: Birmingham University gave Robert Davis an honorary degree. 1952: Siebe Gorman became a limited company. Robert Davis became its managing director. 1952: Marconi and Siebe Gorman collaborated to produce an underwater television camera system. 1953: Some sport divers find how to make an aqualung regulator out of a Calor gas demand regulator, and spread this knowledge, thus bypassing the naval/industrial monopoly on making usable underwater breathing apparatus. 1954: Around now Siebe Gorman started making Cousteau-Gagnan-type aqualungs, and diving suits for commercial and sport diving. In September 1954, the inaugural issue of the British Sub-Aqua Club magazine Neptune contains a full-page Siebe Gorman advertisement for three sets of "Essjee" underwater breathing apparatus: The Standard Aqualung (single cylinder); The Twin Cylinder Aqualung