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RE: Does a Karlson Pipe count - maybe - should Fulmer get credit for this way?

how does your pipe sound? Karlson used coupled cavity action, Fulmer put a slot on the end of pipes. Karlson produced eariler lab notes than RCA/Olson - dunno in this case

N.C. Fulmer US 2787332 filed 1952 “Loud-Speaker System”

Here's Norman C. Fulmer's Patent

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