IEEE - The IBM 608 Transistor Calculator was the first to use solid-state transistor circuits rather than vacuum tubes, with 3,000 germanium transistors. | Facebook
core, memory, unit, calculator, electronic, register, wire, magnetic, magnetic core, fuji, transistor | Pikist
BJT Transistor as a Switch, Saturation Calculator
BJT Transistor Biasing Calculator
John Wolff's Web Museum - Early Electronic Calculators - Desktop
The IBM 608 Calculator
Dr. Calculus - PCB Heaven
Digital Logic - 4 | calculator made of discrete transistors - YouTube
4 Bit Calculator | Built Using Individual Transistors
Tracing the history of electronics through the Old Calculator Web Museum - Marketplace