Which shipyard has a fleet that was laid down on April 21, 1962?
CREATE TABLE table_4454 (
    "Shipyard" text,
    "Laid down" text,
    "Launched" text,
    "Commissioned" text,
    "Fleet" text,
    "Status" text
)
SELECT "Shipyard" FROM table_4454 WHERE "Laid down" = 'april 21, 1962'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which shipyard has a fleet that was laid down on April 21, 1962? ### Input: CREATE TABLE table_4454 (
    "Shipyard" text,
    "Laid down" text,
    "Launched" text,
    "Commissioned" text,
    "Fleet" text,
    "Status" text
) ### Response: SELECT "Shipyard" FROM table_4454 WHERE "Laid down" = 'april 21, 1962'