Task: Question Generation
Input (English): Context : The Oakley-class lifeboat refers to two types of self-righting lifeboat operated by the Royal National Lifeboat Institution around the coast of the United Kingdom and Ireland between 1958 and 1993. 
Subject : Oakley-class lifeboat 
Relation : service entry
Output (English): What year is Oakley-class lifeboat associated with?