TV Sitcoms

Which of these sitcoms features an animated family whose father deals in propane and propane accessories?

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On "Friends", what was Central Perk before it became a coffee place?
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What is the middle name of Jefferson on "Married With Children"?
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In what Pennsylvania city is NBC's "The Office" set?
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In season 8 of "The Big Bang Theory", Penny becomes a sales rep for what kind of company?
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On the show "Martin", what was the name of the singing mechanic played by Martin?
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On "Happy Days", what rock group stayed at Richie's house?
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Which TV show is about a 30 year-old actor, living in New York City?
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On what channel does "Curb Your Enthusiasm" air?
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