When did Boosey-Hawkes put a 4th valve on it's Eb's?

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jon112780
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When did Boosey-Hawkes put a 4th valve on it's Eb's?

Post by jon112780 »

Does anybody know the year? Was it pre-1910?
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KarlMarx
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Post by KarlMarx »

The Blaikley 3+1 comp system was patented around 1878.

There are one or two comprehensive brass galleries available on the web. Please, have a go there.

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