New York City record and building trades directory (1892)
New York City Record Pub. Co · Park Row, N.Y. : New York City Record Pub. Co. · leaf 700
CALL. 55 EAST NEW YORK. The accompanyingillustrations representthe practical working ofan extremely simple Im-provement in speakingtubes, the mouth piecebeing provided with anattached ear piece,« hereby messages maybe more conveniently re-ceived and transmitted.This improvement hasbeen patented by… … EARIPHONE. One of the illustrations shows the improvement in use in thehallway or vestibule of a house, another representing its employmentin a factory, where the different floors are thus held in communica-tion with the office. The mouth piece may be of the usual form,but the tube in front of the…
Building · Building laws
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