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Discussion Starter · #8 ·
I'm researching the dates because I developed a reed valve sump breather for the Norton twin in the mid 1980s (with an EGR reed valve) and want to see similar reed valves and reed valve sump breathers in that era.

I'm also curious to know which came first - the Jawa speedway one way sump valve or the BMW one way breather (these earlier breathers were not reeds).
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