Assertion: snorkel's tube | /r/CapableOf | extend behind the center of the user's head
Facets:
value: directly
type: MANNER
Source sentences:
text: It has also been discovered, according to the present invention, that the design of the breathing tubes may either extend straight back behind the ears so that the two breathing tubes do not come together and are separated by a strap which fits around the back of the user's head, or alternatively can be configured to come together and thereafter extend into one large tube extending directly behind the center of the user's head.