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The larger image is a Maw’s double valved inhaler. It is shown in Maw’s catalogue of 1869. The smaller image below is of Maw’s valved inhaler, understood to date from the 1880’s.
In both cases the mouthpiece has a valve allowing air to enter the inhaler.
In both cases the mouthpiece has a valve allowing air to enter the inhaler.
Maw’s valved inhalers
