Sentence:  He was , however , fortunate in his contact with Prof. J. G. L. Manthey ( 1769 - 1842 ) , teacher of chemistry , who , in addition to his academic chair , was also <WSD>proprietor</WSD> of the `` Lion Pharmacy '' in Copenhagen where Oersted assisted him . 
Meaning of the word marked with <WSD> tags:  (law) someone who owns (is legal possessor of) a business