There was Bruder, Adolf (1874-1916) Graslitz,
Anton (1897-1820) Graslitz,
Franz 1895-1925 Graslitz,
Ignaz 1838-1914 Wein,
Johann 1770-1944 Ofen,
Josef 1903-1945 Graslitz,
Wenzel 1860-1945 Graslitz,
Stowasswers Sohne.
Those that were still around in 1945 were expropriated. The helicon was introduced/invented by Stowasser in 1849. By the way, Stowasser Sons advertised in U.S. trade publications in the mid 1890s. So there was clearly someone in the U.S. who was their agent. That might explain all the horns in the U.S.
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