Assertion: tank's engine | /r/HasProperty | upgraded to the 750 hp l60 mark 9a
Facets:
value: in 1977
type: TEMPORAL
Source sentences:
text: In 1977 the engines of all British Army vehicles were upgraded to the 750 hp L60 Mark 9A, followed by further upgrading with the L60 Mark 11A or L60 Mark 12A [xxvii] in 1978 as part of the 1977 "Dark Morn" and the 1978 "Sundance" programmes.