Task: Question Generation
Input (English): Context : The Cessna 210 Centurion is a six-seat, high-performance, retractable-gear, single-engine, high-wing general aviation aircraft which was first flown in January 1957 and produced by Cessna until 1985. 
Subject : Cessna 210 
Relation : service entry
Output (English): In what year did Cessna 210 enter service?