The History of the Thayer Valve

Sources:
International Trombone Association Journal
- The Story of Ed Thayer and his Axial-Flow Valve
- The Axial Flow Valve Update

The Thayer Valve and It's Effect on a Generation and Beyond by David John Clovis II

thelasttrombone.com
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Aidan Ritchie
- The Thayer Problem

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