ROYAL E. HOUSE'S TELEPHONE OF 1868. ROYAL E. HOUSE'S TELEPHONE OF 1868. 2 HOUSE'S MODERN PHONETIC TELEGRAPH., scientific american, 1886-11-13
ROYAL E. HOUSE'S TELEPHONE OF 1868. ROYAL E. HOUSE'S TELEPHONE OF 1868. 2 HOUSE'S MODERN PHONETIC TELEGRAPH., scientific american, 1886-11-13
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