Ragnvald Blakstad
Ragnvald Blakstad ( 20 May 1866 – 26 April 1929 ) was a Norwegian industrialist and hydropower pioneer . 
<triplet> Ragnvald Blakstad <subj> 20 May 1866 <obj> date of birth <subj> 26 April 1929 <obj> date of death