Franz Xaver Riepl
Franz Xaver Riepl ( 29 November 1790 – 25 April 1857 ) was an important Austrian geologist , railway pioneer and metallurgical specialist . 
<triplet> Franz Xaver Riepl <subj> 29 November 1790 <obj> date of birth <subj> 25 April 1857 <obj> date of death <subj> Austria <obj> country of citizenship