In the United States, luthier/inventor Paul Bigsby began building solid-body electric mandolins (technically, they consisted of a solid wood core housing the electronics, with hollow wings forming the body) in 1949. His first one had ten strings and was built for Al Giddings. Bigsby's most famous mandolin, built in 1952, was owned and played by Western swing musician Tiny Moore. This instrument had five single courses rather than the more common four double courses, and was patterned after a similar instrument built by Jim Harvey of La Jolla, California, for a player named Scotty Broyles. Gibson and Rickenbacker introduced solid-body eight-string mandolins in the 1950s, while Fender followed the single-course idea with its four-string version.