How many judges sat on the bench to hear the landmark case of Keshavananda Bharati v. State of Kerala in 1973?

The Kesavananda Bharati case (1973) was heard by the largest ever bench of 13 judges of the Supreme Court. This landmark case established the 'basic structure doctrine' - that Parliament's amending power cannot alter the Constitution's basic features. Smaller benches (7, 9, 11) are used for important cases but 13 is unprecedented.