Crossword puzzle clue "they were introduced on e day"

They were introduced on "E-Day"

They were introduced to Western pop music during the British Invasion

TV horse introduced in 1955 ... or a Plymouth model introduced in 1956

The first ones were introduced in blonde and brunette in 1959

Were introduced

Decade when ZIP codes were introduced

1980 text adventure that introduced the line "You were eaten by a grue"

Particle physicist whose findings were first accepted by Einstein, but later were shown to be fraudulent