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			EL-W506X • Textbook style display • Maths drill function • Constant/chain calculations • Multi-line playback • List calculations • Matrix function EL-W531X EL-W531XH EL-W531XG • Textbook style display • Maths drill function • Constant/chain calculations • Multi-line playback EL-506X • Constant/chain calculations • Multi-line playback • Solver function • List calculations • Matrix function • Sturdy, stylish design EL-520X • Constant/chain calculations • Multi-line playback • Solver function • Sturdy, stylish design EL-531XH EL-531XG • Constant/chain calculations • Multi-line playback • Sturdy, stylish design EL-509X • Constant/chain calculations • Multi-line playback • Sturdy, stylish design EL-W506 • Textbook style display • Math drill function • Constant/chain calculations • Multi-line playback • List calculations • Matrix function • Cool black design EL-W531 EL-W531G EL-W531H • Textbook style display • Math drill function • Constant/chain calculations • Multi-line playback • Cool black design EL-9900 • Reversible keyboard: basic & advanced • Graphing capability • Slide show feature • Solver function • Matrix function EL-506W (BK/WH) • Constant/chain calculations • Multi-line playback • Solver function • Matrix function • List calculations • Sturdy, stylish design EL-520W (BK/WH) • Constant/chain calculations • Multi-line playback • Solver function • Sturdy, stylish design EL-531WH (BK/BL/WH) • Constant/chain calculations • Multi-line playback • Sturdy, stylish design EL-509W/531W (BK/WH) • Constant/chain calculations • Multi-line playback • Sturdy, stylish design EL-500W • Constant/chain calculations • Multi-line playback • Sturdy, stylish design EL-503W • Constant/chain calculations • Display equations • Playback function EL-510R • Constant/chain calculations • Display equations • Playback function EL-5250 • Programmable up to 4,096 steps • Solver function EL-738 • Compound interest calculation • Bond calculation • Constant/chain calculations