Method and means for completely substituting gaseous mixtures in closed rooms
US3195538A
Hydraulic air bells
US3111946A
Breathing equipment particularly for divers
GB948056A
An improved gas pressure-reducing valve
US2882895A
Open-cycle breathing apparatus
GB815547A
Improvements in telephonic appliances for frogmen
US2874692A
Open-cycle breathing equipment, particularly for skin-divers
GB691153A
Improvements in helmets and corselets for closed diving-suits of the type with separation of the gases provided with a regulator of distribution of the air for breathing
US2792832A
Breathing gas supply for a diving suit
GB686506A
Improvements in closed diving-suits of the type with separation of the gases and discharge of the expired air straight in the sea
US2693180A
Exhalation valve for diving suits
US2693179A
Apparatus for underwater immersion
GB644267A
Improvements relating to underwater observation chambers
GB279483A
Improvements in or relating to submarine hulls or the like
US1808599A
Resistant submarine hull or the like
AU1105219B
Improvements in or relating to the consturction arragement and mode of use of shipbuilding yards
