История создания и модернизации Российсого водолазного шлема

First Russian threebolt gear was development in the beginning of the 1930s, and became the base for all diving gear for years to come. It consisted of the SHA-3 helmet with a corselet, a diving suit, diving shoes, weights, a belt with knife, air hose and communication cable. The construction of the SHA-3 helmet was better than Siebe-Gorman and Denayrouze helmet because of the simplicity and reliability. The SHA-3 helmet had telephone cable and air hose inputs, a rubber disk safety valve, one push button head valve and a telephone And microphone held with pins. (from book of Pavel A. Borovikov)