From Extension Cords to Musical Instrument Cables: A pioneering family-owned international manufacturer of cables for musical instruments, microphones, patches, etc., Mexico City-based Solcor Cables launched in the ’70s as a manufacturer of extension cords that came in many colors. By 1986, entrepreneur Soledad Corona and her small staff had become a major supplier of extension cords to the biggest retail stores in Latin America—the largest of these being Walmart.