Seinfeld
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Seinfeld (1989-1998) was an enormously popular American sitcom that occupied the Thursday 9pm timeslot on NBC before Frasier took it over.
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Mentioned once in Good Grief.
Good Grief
Season 6 · Episode 1 · S06E01
“however when 'Seinfeld' finally went off the air 'Frasier' was used to fill the slot at 9:00pm”