Assertion: bus's route | /r/HasProperty | launched by ong teng cheong
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Source sentences:
text: Although Sentosa was already operating several ex-London double decker buses such as the AEC Regent III RT and the Leyland Titan RTL from 1975 to the early 1980s, double-decker buses only made a major comeback in Singapore's public bus system on 13 June 1977 when Singapore Bus Service (SBS, present-day SBS Transit), introduced 20 Leyland Atlantean AN68 buses on route 86 which was launched by then-Deputy Prime Minister and Minister of Communications Ong Teng Cheong that day.