The Sharp EL-556L Scientific Calculator is a handheld device with regular key and display size. It operates on battery power.  It's a vintage advanced scientific pocket calculator released in the late 1980's or early 1990's. It features Direct Algebraic Logic (D.A.L.), a 2-line display, and packed around 286 scientific functions, including unit conversions and physical constants, tailored for high school and advanced studies.
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