Meanwhile, in postwar Tokyo…

Parametron: 50s Japanese computer that uses neither transistors nor vacuum tubes ethw.org

In 1950s Japan, engineers built working computers with neither vacuum tubes nor transistors, using resonant circuits called parametrons that stored bits as the phase of an oscillation. The machines were reliable and cheap to make, and then the transistor swept the field and the whole lineage vanished from the story we tell about computing.