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I realize that it defies logic after reading the messages, but when I look at the sound board, there is an oval with the numbers 8426. I tried to see if there was another number preceding it, but that is the only four numbers I see. Am I looking in the wrong place? It also states; Chicago USA, Speci...

I also have an upright HP Nelson #8426, and just started doing some research on it. If you find a site, I would appreciate any info you can give. Thanks