Assertion: snorkel | /r/HasProperty | developed
Facets:
value: only recently
type: TEMPORAL
value: due to such problems
type: CAUSE
Source sentences:
text: While diving snorkels have long been used to permit divers to breathe when near the surface of the water without lifting their heads from the water, snorkels have only recently been developed to allow swimmers to breathe while using the front crawl or other strokes without lifting or turning their heads.
text: While diving snorkels have long been used to permit divers to breathe when near the surface of the water without lifting their heads from the water, snorkels have only recently been developed to allow swimmers to breathe while using the front crawl or other strokes without lifting or turning their heads.
text: While diving snorkels have long been used to permit divers to breathe when near the surface of the water without lifting their heads from the water, snorkels have only recently been developed to allow swimmers to breathe while using the front crawl or other strokes without lifting or turning their heads.
text: Due to such problems associated with basic snorkels, snorkels have been developed that shield the air portal from waves or which seal the air portal of the snorkel tube.