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Indian-head test pattern - Wikipedia
Television RCA Sign off Alignment Test Pattern - YouTube
Signing Off, Signing On, Test Patterns, and the Peacock
Remember When Television Ended at Midnight? - Old Timey Herald
The Television Symbol - BBC
The History of TV Color Bars, One of the First Electronic ... - VICE
Test card - Wikipedia
Test Pattern History: How Color Bars Became a TV Staple
Indian Head Test Pattern - Media College
Designing the first BBC television ident - National Science and …
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