Gakken EX-150 electronics experimentor kit
(aka - Denshi Blocks)

Acquired for a mere 9.95USD on the eBays. This is one of the original kits from the late 70's. It has since been reissued by the Gakken company in 2002.

otonanokagaku.net/products/kit/index.html

en.wikipedia.org/wiki/Gakken_EX-System
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