1921-1950
RB through the ages 1923 Newfeldt and Kuhnke 1924 Helium-Zuurstofduik 1926 Bade-Tauchretter 1929 Momsen Lung 1930 Beebe 1936 Chariots 1937 DESCO 1937 Peress 1938 Cousteau 1940 LARU 1941 Hans Hass 1942 Siebe Gorman ANS 1947 Mark V Heliumhelm 1948 USSR SKD helmen
 
1923 Newfeldt and Kuhnke
1924 Eerste Helium Zuurstofduik
1926 Bade-Tauchretter
1929 Momsen Lung
1930 William Beebe en Otis Barding
1936 Chariots
1937 Desco Rebreather & Nohl
1937 Peress
1939 Cousteau 
1941 LARU
1941 Hans Hass
1942 ANS
1947 Mark V heliumhelm
1948 USSR SKD helmen