Provided that the total percentage of the reservations so made shall not exceed fifty percent at any time.

Power to amend Schedules.- The Government may, by

notification publish in the Official Gazette, amend by way of addition, omission or variation any of the items of the 1[Schedule-I, II, III and IV] to this Act, and when the Schedule is so amended, such addition, omission or variation shall have the effect as if it had been made by this Act.