the Deane Helmet, which had been rescued by John Bevan when Siebe Gorman closed down, was put on display at the Diving Museum in Gosport. Operations The Company was notable for developing the "closed" diving helmet of the standard diving dress and associated equipment. As the helmet was sealed to the diving suit, it was watertight, unlike the previous "open" helmet systems. The new equipment was safer and more efficient and revolutionised underwater work from the 1830s. Colonel Charles Pasley, leader of the Royal Navy team that used Siebe's suit on the wreck of suggested the helmet should be detachable from the corselet, giving rise to the typical standard diving dress which revolutionised underwater civil engineering, underwater salvage, commercial diving and naval diving. Standard diving suit equipment was their main manufacturing operation, producing diving helmets in copper and brass. They also made frogman's equipment for the British armed forces during World War 2, and later, sport scuba gear. See makes of rebreather. Siebe Gorman and Co manufactured 12 bolt, 8 bolt, 6 bolt, 3 bolt, 2 bolt, no bolt, flange, and 12 bolt square corselet standard diving helmets. Heinke Ltd in London also made diving gear and had connections with Siebe Gorman. Siebe Gorman product list Rebreather equipment This is a partial list of some of their rebreather equipment covering military and civilian, diving and non-diving. Aircrew Rebreather "Stelox" Aerorlox (mine rescue, liquid oxygen) Siebe Gorman Novus SCBA Amphibian Mark I to Mark IV ATEA Siebe Gorman Universal Rebreather or CDBA (Clearance Diver Breathing Apparatus) DSEA Siebe Gorman FireOX Fleuss-Davis SCUBA apparatus (see Henry Fleuss) Individual scrubber Lungovox (a short-duration industrial oxygen rebreather in a backpack box) Minox MRS suit Oxylithe P-Party (Mark I, Mark II, and Dutch) Proto Proto ten Proton Savox Sladen suit (as used by the British Human torpedo crews) Salvus A.N.S Watchkeepersuit Other items Air lock diving-bell plant Gasmasks Drysuits (with tradename "Frogman" when sold to the public market) The Bragg-Paul Pulsator medical ventilator References External links Grace's guide to British Industrial History: Siebe, Gorman and Co. Unique rebreather tear down by Jan Willem Bech on Therebreathersite Siebe Gorman archive photographs at Trinity Marine Siebe Gorman. Siebe Gorman Diving Helmets Gallery. Current Siebe Gorman website Scrapbook of diving history: Siebe Gorman Classic Dive Books: Robert H. Davis, books on or published by Siebe Gorman & Co. and Henry Siebe. Siebe-Heinke Dip Dry Suit Siebe-Heinke Frogman Dry