Assertion: flipper | /r/HasProperty | 2of the flipper
Facets:
Source sentences:
text: At that time, an angle is made between the shoe (1) and fin (2) of the flipper, which makes the wearer feel comfortable just as he would when walking and the wearer can exert his or her force with the entire leg (see FIG. 9) instead of the tiptoes as with the prior art flipper.