Artikel 28

1. Where the legislation of a Contracting Party makes the acquisition, maintenance or recovery of entitlement to benefits conditional upon the completion of periods of insurance, the institution which applies that legislation shall, to that end, for the purpose of adding periods together, take account of periods of insurance completed under the legislation of any other Contracting Party and, where appropriate, of periods of residence completed after the age of sixteen under non-contributory schemes of any other Contracting Party, as if they were periods of insurance completed under the legislation of the first Party.
2. Where the legislation of a Contracting Party makes the acquisition, maintenance or recovery of entitlement to benefits conditional upon the completion of periods of residence, the institution which applies that legislation shall, to that end, for the purpose of adding periods together, take account of periods of insurance completed under the legislation of any other Contracting Party, and, where appropriate, of periods of residence completed after the age of sixteen under non-contributory schemes of any other Contracting Party, as if they were periods of residence completed under the legislation of the first Party.
3. Where, under the legislation of a Contracting Party, a person has been affiliated at the same time to a contributory scheme and to a non-contributory scheme for the same contingency, the institution of any other Contracting Party concerned shall have regard, in applying paragraphs 1 or 2 of this Article, to the longest period of insurance or of residence completed under the legislation of the first Party.
4. Where the legislation of a Contracting Party makes the provision of certain benefits conditional upon the completion of periods of insurance in an occupation covered by a special scheme or in a specified occupation or employment, only periods completed under a corresponding scheme, or, failing that, in the same occupation or, where appropriate, in the same employment, under the legislation of other Contracting Parties, shall be taken into account for the award of such benefits. If, notwithstanding periods completed in this way, the person concerned does not satisfy the conditions for entitlement to the said benefits, the periods concerned shall be taken into account for the award of benefits under the general scheme or, failing that, the scheme applicable to wage-earners or to salaried employees, as appropriate.
5. Where the legislation of a Contracting Party, which does not make entitlement to benefits or the amount thereof subject to any specific period of insurance or employment but makes the provision of such benefits conditional on the person concerned or, in the case of survivors’ benefits, the deceased, having been subject to that legislation at the time at which the contingency arose, that condition shall be considered fulfilled if the person concerned or the deceased, as the case may be, was subject at that time to the legislation of another Contracting Party.
6. Where the legislation of a Contracting Party provides that the period of payment of a pension may be taken into consideration for the acquisition, maintenance or recovery of entitlement to benefits, the competent institution of that Party shall to that end take account of any period during which a pension was paid under the legislation of any other Contracting Party.