Busicom Colex 812-SL
The Busicom Colex 812-SL is a scientific calculator from 1975. It has a slim, brick-shaped plastic case measuring 77mm x 143mm x 17mm and weighs 172g including the internal rechargeable batteries. The calculator is powered by 4.8V from four N-sized 1.2V Matsushita batteries. It can be recharged using an adapter …