2018-05-07/2020-04-09 - From the builder's web site: "Helderop Pipe Organs was formed in 1988 to provide pipe organ service for the Great Lakes Region. What began as a tuning and repair service has now become a full service organ building factory. Located in the heart of Detroit, in a renaissance industrial complex, Helderop Pipe Organs continues to be a leader in quality instruments."
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