Nobel Prize in Physics in 1909
= Nobel Prize in Physics in 1909
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<Guglielmo Marconi> and <Karl Ferdinand Braun> shared the award equally for developing <wireless telegraphy>.<The Nobel Prize in Physics 1909 by Nobel Prize Outreach>[Official summary: laureates, prize shares and motivation]{ref} <Braun's receiver coupling experiment> connects that history to <resonance> and the selectivity of a receiver.