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Herbert Henry Adolph Proposch
GP
Gustav
Proposch
1865–1948
Gustav
Proposch
d. 1961
HP
Herbert
Proposch
d. 1956
Adolph
Proposch
d. 1963
Wilhelm
Proposch
d. 1970
IW
Ivy
Welsh
1895–1975
CK
Catherina
Koehler
1870–1964