How many spinoffs did the TV series "Happy Days" (ABC, 1974-84) generate?

The TV series “Happy Days” (ABC, 1974-84) generated three spinoffs:

“Laverne and Shirley” (ABC, 1976-83) “Mork and Mindy” (ABC, 1978-82) “Joanie Loves Chachi” (ABC, 1982-83).

How many spinoffs did “The Mary Tyler Moore Show” (CBS, 1970-77) have? "The Mary Tyler Moore Show" (CBS, 1970-77) had three spinoffs, all on CBS: "Rhoda" (1974-78); "Phyllis" (1975-77); and "Lou Grant" (1977-82).
When did Bela Lugosi first play Count Dracula? The Hungarian actor Bela Lugosi first played the role onstage in the 1927 Broadway production of Dracula. It was adapted by Hamilton Deane and John Balderston from Bram Stoker's novel. Lugosi became famous…
How much credit card debt does the average American owe? The average credit card holder in the U.S. owes $2,317 on credit cards, according to the Nilson Report, Santa Monica, California. About 60 percent of American adults own at least one credit card.
What was the name of the high school in “Room 222” (ABC, 1969-74)? Walt Whitman High School was the high school in the TV series "Room 222" (ABC, 1969-74). In "Welcome Back, Kotter" (ABC, 1975-79)? James Buchanan High School. In "Head of the Class" (ABC, 1986-91)?…
Who were “He and She” on the TV series (CBS, 1967-68)? Real-life married couple Richard Benjamin and Paula Prentiss played Dick and Paula Hollister on the TV series "He and She" (CBS, 1967-68). He was a cartoonist, she a social worker. They lived in…
Where did Archie and Edith Bunker of “All in the Family” (CBS, 1971-79) live? Archie and Edith Bunker of "All in the Family" (CBS, 1971-79) lived at 704 Houser Street in Queens, New York.