I picked these up at a swap meet yesterday. I know what the oxygen regulator is but what are the other two items? I'm guessing either suction or respirator/ventilator. The two lower items attach with a spring loaded chuck and it appears the plug attached to the chain is used when the items aren't attached. All three items were in the same bin but not attached so not sure if they even go together. Schrader is the name on the two lower items. The oxygen regulator is from The Liquid Carbonic Corporation Model LM480 (Ironically there is one listed on ebay right now). Any ideas on the vintage of these items? Thank you. Note: The lenses on the regulator are glass not plastic.
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