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Old 5th Jun 2021, 1:22 pm   #9
Andrew B
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Join Date: May 2015
Location: Bradford, West Yorkshire, UK.
Posts: 458
Default Re: Hickok 539b bias gauge

Quote:
"sealed do not open"
is a warning, much the same as "DANGER high voltage" or "No User serviceable parts", none of these warnings need apply to a careful and observant person.
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