CREATE TABLE table_75587 ("Name" TEXT, "Pennant number" TEXT, "Builder" TEXT, "Laid Down" TEXT, "Launched" TEXT, "Commissioned" TEXT, "Current status" TEXT)

what builder launched the name minerva
SELECT "Launched" FROM table_75587 WHERE "Name" = 'minerva'
SELECT "Launched" FROM "table_75587" WHERE "Name" = 'minerva'