Walter Frederick Morrison disc more cheaply. In 1955, he and Lu designed the Pluto Platter, the archetype of all modern flying discs. On January 23, 1957, they sold the rights for the Pluto Platter to the Wham-O toy company. Initially Wham-O continued to market the toy solely as the "Pluto Platter", but by June 1957 they also began using the name "Frisbee" after learning that college students in the Northeast were calling the Pluto Platter by that name. Morrison also invented several other products for Wham-O, but none were as successful as the Pluto Platter. Morrison and his wife, Lu Nay Morrison had
Generic antecedent the pronouns as generic and hence gender-unspecific. Ambiguity arises from the possibility that the listener might interpret the meaning differently from what the speaker intended. Speakers of all languages use words "both" to make distinctions "and" to generalize: What has become controversial among users of English is the choice of pronoun to refer back to a generalized, and hence generic, singular antecedent such as "any parent", or "every parent". In contrast, since plural generic antecedents such as "parents" must be referred to by the plural pronoun "they", and since in English "they" is gender-unspecific, no controversy arises for a plural