Sharp EL-531XBGR Scientific Calculator for sale online | 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 Sharp D.A.L. Scientific Calculator EL- 531G - w/ case Tested, Works EUC | eBay
Sharp EL-531W Advanced D.A.L. Scientific Calculator Translucent Blue With Cover 74000016620 | eBay