| The Edison phonometer - device by means of which a mechanical work is obtained by speech in 'Nature' 1878(The Edison phonometer - device by means of which a mechanical work is obtained by speech in “” Nature”” 1878.)Unknown artist | 
| € 134.75 
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| Undated                                                                 ·  drawing
                                                                 ·  Picture ID: 990891 Private Collection / Bridgeman Images | 
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