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|Date of birth||19 August 1899|
|Place of birth||Vienna, Austria–Hungary|
|1921–1924||SC Ober-Sankt Veit|
|1927–1928||Attila FC Miskolc|
* Senior club appearances and goals counted for the domestic league only.
Powolny made his professional debut in 1916 for Austria Vienna, before moving to SC Ober-Sankt Veit in 1921. He moved to Wiener AF in 1924, before signing with Italian side Reggiana just 6 months later. After Reggiana were relegated to Serie B, Powolny moved back to Serie A with Inter Milan, where he became the top scorer in the 1926-1927 Serie A, scoring 22 goals. He later played in Hungary with Attila FC Miskolc and Sabaria FC, before returning to Austria with Wiener Sportclub in 1929. He coached Czech side RFK Reichenberg between 1931 and 1935.
- (Italian) Profile at Inter Archive
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