Retroactive Effectiveness Clause Rückwirkungsklausel Retroactive Effectiveness Clause Cláusula de Efectividad Retroactiva Cláusula de Efectividad Retroactiva Clause d'effet rétroactif סעיף תוקף חזרה पूर्ववत प्रभावशीलता शर्त 追認効力条項 Cláusula de Eficácia Retroativa 追溯效力条款 A Retroactive Effectiveness Clause is a provision in a contract that makes it effective from a date before it was actually signed.