Assertion: flipper | /r/MadeOf | at least an extensible element
Facets:
Source sentences:
text: Said aim is achieved by the present invention by means of a swimming flipper consisting of a footwear or shoe equipped with a sole provided on its front and lateral sides with at least two protruding elements, and a blade connected to said sole; said flipper consists of at least an extensible element substantially transversal with respect to the blade and laterally connected to said protruding elements and centrally to the flipper surface in an area between said protruding elements.