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#10
11-13-2019, 09:55 PM
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Some doorknob resources here - https://www.bing.com/search?q=doorkn...BLH&sp=1&ghc=1
Actually doorknobs in TV sets fell out of vogue in the early '50s, as all-glass CRTs phased out the old metal bell types. Glass tubes, by dint of inner and outer dag coatings, provided their own HV filtering, so doorknobs weren't needed. But out of convention, some mfrs continued using doorknobs for a while anyway. 
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