HMV Half Tone Needles Case

Toscanini, Verdi: "La Traviata" Prelude to Act 1 and 3 with New York Ph.

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Voices of the Past. Vol. 9 The HMV French Catalogue 1899-1925

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Das deutsche Luftschiff seine Geschichte, Einrichtungen und Fahrten

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The Story of the Airship

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The stubborn Dirigible

Pfanstiehl Phonograph Needles

『飛行船帝国』

Walter, Wagner: "Die Walküre" Act I

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月刊誌『科學知識』昭和五年四月號

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Million Dollar Popular Steel Needles case