Ronstadt is an American popular-music singer and record producer. She embarked on a solo career in the late 1960s and became known for her interpretations of folk songs and collaborations with artists from a diverse array of genres. She became one of the most successful female singers of the 1970s and branched out in the 80s with award-winning Spanish language albums. One of her grandfathers was an inventor who made a fortune by patenting what widely used household item? Discuss
Source: The Free Dictionary