Invention on Instagram: "The Casio QL-10 Calculighter was introduced in 1978 as a compact electronic calculator with a built in lighter housed in the same body. It combined a standard late 1970s pocket calculator layout with a mechanical ignition and flame port mounted on the side of the device. At the time, Casio was actively experimenting with multifunction consumer electronics that blended everyday tools into single portable products. From an engineering standpoint, the QL-10 reflects the des