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Oskar LEIBLINGER: b. ? - d. ?
N.B. Not 100% sure of this family relationship but looks likely ...
Mention of completion of "Magister" at Lemberg University:
ANNO, Pharmaceutische Presse, 1913-01-11, Seite 6
https://anno.onb.ac.at/cgi-content/anno?aid=ppr&datum=19130111&seit...
It appears that Chaim/Karl LICHTENTHAL had completed studies in pharmacy and took over the store run by his father-in-law after Alois LEIBLINGER's death in 1908. However, confusingly, he features here under the first name of Joachim - which is, in fact, a regular alternative to Chaim but was a first name actually officially given to his brother Sigmund.
Both A. LEIBLINGER & Joachim LICHTENTHAL are listed together for the start of the year 1908.
ÖNB-ANNO - Fromme's Pharmaceutischer Kalender
https://anno.onb.ac.at/cgi-content/anno-plus?aid=fpt&datum=1908&pag...
In 1920 J. LICHTENTHAL is listed as "A. LEIBLINGER - Erben" - i.e. heir to business.
ÖNB-ANNO - Fromme's Pharmaceutischer Kalender
https://anno.onb.ac.at/cgi-content/anno-plus?aid=fpt&datum=1920&pag...
However by 1922 the business had apparently passed on to an "O. LEIBLINGER" (also noted as A. LEIBLINGER Erben). This is presumably Oskar LEIBLINGER, possible son of Alois?, who had only later completed his pharmaceutical studies.
ÖNB-ANNO - Pharmaceutischer Almanach
https://anno.onb.ac.at/cgi-content/anno-plus?aid=pca&datum=1922&pag...
Likewise later in 1932 (but no longer with additional note that "A. LEIBLINGER Erben"):
ÖNB-ANNO - Pharmaceutischer Almanach
https://anno.onb.ac.at/cgi-content/anno-plus?aid=pca&qid=T1I9T5VD4J...