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
| Autor: | Scruby, Robinett |
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| Jazyk: | angličtina |
| Rok vydání: | 1922 |
| Předmět: | |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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