user: Question: What date was introduced where it was withdrawn 1955?
Columns: ['Number Range', 'Introduced', 'Builder', 'Engine', 'Seats', 'Withdrawn']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', '1934', 'Park Royal', '1 AEC of hp (kW)', '69', '1955']
SQL:

assistant: SELECT "Introduced" FROM "Table" WHERE "Withdrawn" = '1955';