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Radio Record, Volume I, Issue 47, 8 June 1928, Page 7

ORE than 3600 patents have been granted to radio inventors since {he invention of radio. Of this total 222 putents have been granted on transmitters, 807 on receivers, 119 on receiver antennae, 875 on special ray and twenty-eight on waye-meters. RAvIO is the supreme test for sopranos or other singers, says Idouard Albion, director of the Washington National opera. If the voice doesn’t go over the air well it's a safe bet it won't go over the footlights, he adds.