CREATE TABLE table_11911 ("Model" TEXT, "Released" TEXT, "Form factor" TEXT, "Chipset" TEXT, "Memory Type" TEXT, "Max. Memory" TEXT)

what is the release date of the model precision m60?
SELECT "Released" FROM table_11911 WHERE "Model" = 'precision m60'
SELECT "Released" FROM "table_11911" WHERE "Model" = 'precision m60'