WJZ-TV began as WAAM Channel 13 in 1948, and was an ABC affiliate and also a DuMont station as well. In 1956, when DuMont perished, it had ABC all to itself. In 1957, Thirteen's original owners Herman and Ben Cohan, both brothers and business magnates, sold the station to the Westinghouse Broadcasting Company, and Thirteen was renamed WJZ (which ironically was the callsign of the first ABC station in New York City in 1948). In 1995, Group W morphed into CBS Mass Media, and Thirteen became a CBS affiliate after 47 years as an affiliate with The Alphabet Network. 13 still uses the same numerical font from the Westinghouse era since 1963. Thirteen has been located at Television Hill since the early 1950s.
From the mid-to-late 1960's up to the 1970's, WJZ-TV had the same kind of test pattern as used well into the late 1980's/probably early 1990's by KYW-TV in Philadelphia; exactly when would such a TP's use have been ceased by WJZ?
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