(a) Minimum Tier 2 Pensions. Each pension granted pursuant to this Tier 2, regardless of the type of the pension, which became or becomes effective prior to July 1, 1971 and which, as of June 30, 1971, is in a monthly amount of less than $350 shall be increased, effective July 1, 1971, pursuant to the provisions of subsection (b) and subsection (c) of this section, and shall, if such increase results in a monthly pension amount which is less than $350, be increased to provide for a monthly minimum pension of three hundred fifty dollars ($350). Each pension granted pursuant to this Tier 2, regardless of the type of the pension, which becomes effective on or subsequent to July 1, 1971 shall be in a monthly amount not less than the minimum monthly pension amount provided, as of the effective date of the pension, by this subsection of this section. The monthly amount of each such pension never shall be reduced, by reason of the provisions of Section 1422, Section 1424 or subsection (c) of this section, to a monthly amount less than the minimum monthly pension amount provided by this subsection.
(b) Additional Cost of Living Adjustments. The monthly amount of pension of each Beneficiary which, prior to the effective date of this section, had been increased by reason of a cost of living adjustment thereof pursuant to Section 1422 or Section 1424 shall be increased, as of July 1, 1971, by that portion of the percentage of the annual increase in the cost of living, as had been determined by the Board pursuant to Section 1422 which was in excess of 2% but not in excess of 3% for each year the monthly amount of such pension had been increased.
(c) Adjustment for Certain Pensions. The monthly amount of pension of each Beneficiary who heretofore did qualify or hereafter shall qualify for a cost of living adjustment thereof pursuant to Section 1422 or Section 1424 and the monthly amount of pension of each Beneficiary which shall be the minimum monthly pension amount provided by subsection (a) of this section, hereafter shall be increased or decreased, as of the dates provided therefor by Section 1422, by the percentage of the annual increase or decrease in the cost of living as hereafter shall be determined by the Board pursuant to Section 1422.
(e) Savings Clause. Should any provisions of this section at any time be held to be invalid, in their application to certain persons or periods of time such invalidity shall not affect the validity of any provisions as to other persons entitled to benefits hereunder or the applicability as to other periods of time.