Assertion: samurai's sword | /r/HasAspect | its origin
Facets:
value: in shinogi-zukuri
type: LOCATION
Source sentences:
text: The Japanese sword known today with its deep, graceful curve has its origin in shinogi-zukuri (single-edged blade with ridgeline) tachi which were developed sometime around the middle of the Heian period to service the need of the growing military class.