Related: https://en.wikipedia.org/wiki/Gakken_EX-System https://en.wikipedia.org/wiki/Gakken_EX-System https://en.wikipedia.org/wiki/Denshi_block https://en.w

Related: https://en.wikipedia.org/wiki/Gakken_EX-System https://en.wikipedia.org/wiki/Gakken_EX-System https://en.wikipedia.org/wiki/Denshi_block https://en.wikipedia.org/wiki/Denshi_block Most related children's "electronics lab" educational toys (at least in the US) would instead have components laid out on a thick cardboard top of a chassis, with the leads wired to spring terminals. You'd use included lengths of hookup wire between the terminals. (Solderless breadboards and loose components were available at Radio Shack, and promoted by the Forrest Mims books, but those weren't marketed as something you'd buy your kid for Christmas/birthday.)