Assertion: bottle's nipple | /r/HasProperty | practical
Facets:
value: for use
type: PURPOSE
Source sentences:
text: Although Elijah Pratt of New York patented the first rubber nipple in 1845, it took until the 20th century before materials and technology improved sufficiently to allow manufacture of a soft nipple that was practical for use: the invention of vulcanized rubber (1840s) provided a material that was soft and could eventually be manufactured in volume (early 1900s), and could withstand the heat of sterilization.