Assertion: tank | /r/CapableOf | remain secret
Facets:
value: in the first half of 1960s
type: TEMPORAL
value: between its entry into production
type: TEMPORAL
value: for some years
type: TEMPORAL
value: to the west
type: LOCATION
Source sentences:
text: It appears that the tank remained secret to the West for some years between its entry into production in the first half of 1960s and the official acceptance in the Soviet Army in 1967.