(1) The Principal Act is hereby amended by the substitution for Parts I to IV (inserted by section 3 of the Act of 1991 and amended by subsection (1) of section 35) of the Second Schedule thereto of the Parts set out in Schedule A to this Act.
(2) This section shall come into operation -
(a) in so far as it relates to disability benefit, maternity allowance, injury benefit, disablement gratuity and disablement pension, on the 27th day of July, 1992,
(b) in so far as it relates to unemployment benefit, deserted wife's benefit, invalidity pension and retirement pension, on the 30th day of July, 1992,
(c) in so far as it relates to death benefit under section 50, 51 or 52 of the Principal Act, old age (contributory) pension, survivor's benefit, widow's (contributory) pension and orphan's (contributory) allowance, on the 31st day of July, 1992.