Robert Ziegler & Czeslaw Lisowski were at the very least crossing sourcing if not best of friends or related. Czeslaw Lisowski was born in the mid to late 1870s(1876?) and died in 1938 in Warsaw. Some time after WWI he was co-owner of J. Sosnowski, which was founded by Jan Jakub Sosnowski, mistrz rusznikarski - master gunsmith & possibly head of the guild at some point, was born in 1827 in Swisloczu and died in Warsaw in 1905. He partnered with Jan Jachimek(circa 1818 in Prague to 1883 Warsaw) under the shingle Jachimek & Sosnowski. Jan Jachimek had been a partner in Koczi & Jachimek with Antoni Koczi(Kotzi). Getting back to J. Sosnowski, he had a son named Bronislaw Sosnowski who was born in 1863 in Warsaw and died in 1942.

http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=299071&#Post299071
cross ref to Lebeau - Oourally thread.

Kind Regards,

Raimey
rse