解説HP-15C Programmable Scientific Calculator introduced 1982 (edited, built from 2 images).jpg
English: Hewlett-Packard HP-15C, a programmable scientific pocket calculator built from 1982 to 1989. It is powered on and shows the square root of 88.
編集内容:took file HP-15C Calculator-horizontal-2.jpg as a basis and inserted keypad incl. silver rim (for this it was necessary to make the keypad absolutely rectangular instead of using its original deformed state from the source file) as well as complete LCD display from second source file HP-15C calculator, power on, showing square root of 88 (24623476512).jpg, then carried out white balance in GIMP and removed distortions, dust and scratches