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Old 11th Aug 2017, 2:37 pm   #7
peter_sol
Octode
 
Join Date: Aug 2003
Location: Welwyn Garden City, Herts. UK.
Posts: 1,906
Default Re: And the next one! a GEC BT2147

A shadow mask is what is inside a colour TV tube.
Your item is just a mask. Hence the joke in post 3.
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