Sharp EL-531 Scientific Calculator & Case Used - B111 | eBay
Amazon.com: Sharp EL-531TGBBW 12-Digit Scientific/Engineering Calculator with Protective Hard Cover, Battery and Solar Hybrid Powered LCD Display, Great for Students and Professionals, Black,Black and White : Office Products
Vintage professional calculator Sharp EL-531 P, 10-digit display with cover. | eBay