Assertion: straight quotation mark | /r/HasProperty | introduced on typewriter
Facets:
value: to reduce the number of keys
type: PURPOSE
Source sentences:
text: "Ambidextrous" or "straight" quotation marks ' " were introduced on typewriters to reduce the number of keys on the keyboard, and were inherited by computer keyboards and character sets.
text: Straight quotation marks were introduced on typewriters to reduce the number of keys on the keyboard, and they were retained for computer keyboards and character sets.