Transistor Based Calculators
It is the first transistor based electronic calculator with 13 digit number system. It works on Reverse Polish Notation (RPN) system, technique of doing math problems with a multi register stack.
It is a transistorized desk calculator with Nixie-type tube display developed in Japan in 1964. It consists of 4 normal functions and memory that is weighed 25 kg.
It is developed by Industria Macchine Elettroniche in 1964.It is a 16 digit desktop calculator that can perform 4 basic operations and it consists of memory. Here 4 additional keyboards and display can be connected.
It is a high speed, transistor based desktop calculator that offers easy operation. It consists of 4 digit memory capacity with simplified keyboard.
Olivetti Programma 101
It is a programmable calculator which is developed by Olivetti in 1964. It is a commercially successful calculator that offers printing facility.
It is the first Bulgarian desktop calculator developed in 1965 with a 16 digit nixie tube display. It offers square root function. The weight of this calculator is around 8 kg.
Cal Tech is the first pocket friendly handheld electronics calculator developed by Texas Instruments in 1967. It consists of 4 basic functions, 18 keys and a printer.