“microcircuits” (wires and passive components etched onto a ceramic substrate into which active components, like transistors, could be connected) That eventual

“microcircuits” (wires and passive components etched onto a ceramic substrate into which active components, like transistors, could be connected) That eventually became a common construction technique for automotive electronics: https://en.wikipedia.org/wiki/Thick-film_technology https://en.wikipedia.org/wiki/Thick-film_technology