user: Question: Which shipyard has a fleet that was laid down on April 21, 1962?
Columns: ['Shipyard', 'Laid down', 'Launched', 'Commissioned', 'Fleet', 'Status']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Leninskiy Komsomol Shipyard, Komsomolsk-na-Amure', 'December 20, 1958', 'May 12, 1960', 'June 28, 1961', 'Pacific', 'Decommissioned 1989 for scrapping']
SQL:

assistant: SELECT "Shipyard" FROM "Table" WHERE "Laid down" = 'April 21, 1962';