R-9 - Act respecting the Québec Pension Plan

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10. A declaration of the Government that an Act of the Parliament of Canada or of the legislature of another province establishes a similar plan is not invalidated by the amendment or replacement of such Act.
Nevertheless, the Government may, at any time, declare that such an Act is no longer a similar plan.
1965 (1st sess.), c. 24, s. 10.