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There were a lot of different prototypes to the wind instruments we have today before they were standardized
This is what sprung to my mind, too.
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I was hoping the Czechoslovakia might at least narrow down its age a bit, if nothing else.
Well it does indeed! Czechoslovakia was formed in 1918, and was dissolved into the Czech Republic and Slovak Republic in 1993.
Something that sprang to mind was the link between Klezmer and the Jewish population of Czechoslovakia - maybe this was used in Klezmer bands rather than a clarinet.
Robin