    Sentence | Which of Testds inventions was used in radio  evelopment?    Sentence 2 Testds theares on the possbilty of the  (vanemission by radio waves go back as far as lectures  and demonstrations n 1893 n St Lous Mssoul. the  Frarkin insite in Phiadaptra Pennsyivana. and the  \Natond Blectre Light Assocation    