Assertion: flipper's portion | /r/CapableOf | flex about the plane of the blade
Facets:
value: vertically
type: MANNER
Source sentences:
text: A further advantage of the present invention is to provide a unique swim flipper with a unique blade design wherein the blade may have a joint system contained thereon wherein the joint system may allow a portion of the blade to remain rigid while allowing a second portion of the blade to flex vertically about the plane of the blade.