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Metal ammoniaphone, for voice cultivation, in original box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in original box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in original box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in original box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in original box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Advertisement and instructions for use for the ammoniaphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Ammoniaphone, â¬Üfor voice cultivation by chemical meansâ¬"
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Box only for Ammoniaphone
Science Museum Group Collection
© The Board of Trustees of the Science Museum