Air Breathing Valves
Air-breathing valves on storm doors so they’d be easier to close. The valve would automatically bleed off air caught between the inner and outer door.
By M.Malmgren, Aurora, Ill.
December 1960
Air-breathing valves on storm doors so they’d be easier to close. The valve would automatically bleed off air caught between the inner and outer door.
By M.Malmgren, Aurora, Ill.
December 1960
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