L-153 Booklet: “The Echo-Phone and What It Means to You”. 8 pages, showing drawings of Echophone Models No. 10 and No. 5. Very nice REPRINT.
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L-153 Booklet: “The Echo-Phone and What It Means to You”. 8 pages, showing drawings of Echophone Models No. 10 and No. 5. Very nice REPRINT.