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Logo of procrsmedFormerly medchtJournal of the Royal Society of MedicineProceedings of the Royal Society of Medicine
Proc R Soc Med. 1922; 15(Otol Sect): 27–28.
PMCID: PMC2101061

The Thermionic Valve of Professor J. H. Fleming—a Piece of Apparatus capable of amplifying Sound, with a Demonstration to show the Possibilities of applying the Thermionic Valve to aid the Deaf

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