Re: When did proofmeters go into 8N's?

Posted by John D on April 28, 2008 at 14:46:43 [URL] [DELETE] :

In Reply to: When did proofmeters go into 8N's? posted by Dennis Sherman on April 28, 2008 at 14:24:25:

The Proofmeter was added in 1950 at serial number 290271

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