Assertion: kelp | /r/AtLocation | china
Facets:
value: in the 1950s
type: TEMPORAL
value: from japan
type: TRANSITIVE-OBJECT
Source sentences:
text: In China, the kelp Saccharina japonica, introduced from Japan to China in the 1950s and grown on ropes in the Yellow Sea, was used as the main source for the production of crude alginates.