When did these amendments take effect?
The given context provides the following information about when these amendments took effect:

- 3. Ins. by the Acquired Territories (Merger) Act, 1960 (64 of 1960), s. 4 (w.e.f. 17-1-1961).
- 4. Added by the Constitution (Ninth Amendment) Act, 1960, s. 3 (w.e.f. 17 -1-1961).
- 5. Ins. by the Punjab Reorganisation Act, 1966 (31 of 1966), s. 7 (w.e.f. 1-11-1966).
- 6. Ins. by the Rajasthan and Madhya Pradesh (Transfer of Territories) Act, 1959 (47 of 1959), s. 4 (w.e.f. 1-10-1959).