Ammoniaphone, 'for voice cultivation by chemical means', English, 1871-1900.

Made:
1871-1900 in London and England
maker:
Medical Battery Company Limited
Metal ammoniaphone, for voice cultivation, in box, invented

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Metal ammoniaphone, for voice cultivation, in box, invented
Science Museum Group
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Metal ammoniaphone, for voice cultivation, in box, invented, by Dr. Carter Moffat, by Medical Battery Co., London, 1871-1900