According to a trade notice at auction on eBay, they announced their intention to build trumpets in 1936.
Rudy Muck was a German engineer, mouthpiece builder who played in New York City in the Twenties...had a small repair and brassworks shop right down the street from the Bronx Bach factory. He made custom mouthpieces, and went down the street to the Bach factory and got parts to build trumpets and cornets.
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