SELECT "Constructor" FROM table_56648 WHERE "Location" = 'long beach'
Who was the Long Beach constructor?
CREATE TABLE table_56648 (
    "Race" text,
    "Date" text,
    "Location" text,
    "Pole Position" text,
    "Fastest Lap" text,
    "Race Winner" text,
    "Constructor" text,
    "Report" text
)