Hans Weisshaar
Hans Weisshaar ( Wildberg , Baden-Württemberg , Germany , August 25 , 1913 - Los Angeles , June 24 , 1991 ) was an important American violin restorer . 
<triplet> Hans Weisshaar <subj> August 25, 1913 <obj> date of birth <subj> June 24, 1991 <obj> date of death