Valdemar Poulsen
Valdemar Poulsen ( 23 November 1869 – 23 July 1942 ) was a Danish engineer who made significant contributions to early radio technology . 
<triplet> Valdemar Poulsen <subj> 23 November 1869 <obj> date of birth <subj> 23 July 1942 <obj> date of death