آلة حاسبة - المعرفة
The interior of a Casio scientific calculator from the late 1980s, showing the processor chip (small square, top-middle, left), keypad contacts (44 circles, inside back cover, right; 44 matching contacts on a plastic sheet, left), the back of the LCD display (left side, top, marked 4L102E), the battery compartment (empty) and other components.
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