1881 Paris Electrical Exhibition telephone listening room.jpg
Magazine article illustration
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1881 Paris Electrical Exhibition telephone listening room, Telephone listening room at the 1881 Paris Electrical Exhibition, Listening room at the 1881 Paris Electrical Exhibition"The International Exhibition and Congress of Electricity at Paris", Nature, October 20, 1881, page 587.
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1881 Paris Electrical Exhibition telephone listening room, Telephone newspapers, Science exhibitions in Paris, 1881 events in Paris
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ja
1881年パリ電気博覧会電話聴取室、1881年パリ電気博覧会電話聴取室、1881年パリ電気博覧会聴取室 『パリの国際博覧会と電気会議』、自然社、1881年10月20日、587頁。
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1881年パリ電気博覧会電話聴取室、電話新聞、パリの科学展、1881年パリのイベント
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listening