祖父条款(既得权利)
英语：grandfather clause (vested rights)
法语：inapplicabilité d’une loi aux situations en cours
德语：Ausnahme von Rechtsbeschränkungen, für frühere Rechtsbesitzer
意大利语：clausola di inapplicabilità di una legge a situazioni/diritti esistenti
西班牙语：dispensa por tenedores de derechos adquiridos
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