New York Tribune, November 8, 1921, page 3:

50,000  Hear  Curran  Sum  Up  by  Radio
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Wireless  Carries  His  Call  Upon  Voters  to  End  Sinister  Reign  of  Hearst  by  Beating  Hylan  To-day
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Would  Restore  Self-Rule
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City  Deserves  Better  Fate  Than  Four  Years  More  of  Plundering,  His  Last  Plea
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    Henry H. Curran, coalition candidate for Mayor, delivered his final message to the voters of the city last night over the wireless-telephone. He spoke into the apparatus at the De Forrest radio station at Highbridge, which flashed his words to the 15,000 stations in and about New York. It was estimated by the wireless managers that more than 50,000 persons heard his message.
    A wireless telephone connection was hooked up at coalition headquarters at the Murray Hill Hotel, where Mr. Curran's words were written down and distributed to the newspapers. The coalition candidate made a strong last appeal to the voters to defeat Hearstism, Hylanism and Murphyism and to establish a forward looking city government.