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US3331090A
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Liquid suction, storage and discharge device
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US3348538A
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Breathing apparatus exhalation valve with suction control
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Breakaway coupling assembly
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US3318020A
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Breathing mask leak detector and training aid
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Protective shield attachment for face masks
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Process for preparing superoxides
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Demand regulator of the screw thread type
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Demand regulator
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Disc valve
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Underwater talking hood
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Aerodynamic force moment indicator
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Educational turbofan pressure and energy measuring apparatus
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Resiliently mounted candle burner
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Valve assembly for breathing apparatus
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Filter attachment for a pressurized breathing apparatus
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Inhalation/exhalation valve unit having light movable components
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Altitude-compensating, constant-flow, oxygen regulator
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Relief valve
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Demand valve
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US3064854A
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Emergency outlet
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