Publishing Schematics Before "Open Source" Was a Word

Reminds me of a vaguely similar toy you used to be able to get at Radio Shack: the "electronics project kits". Typically, a given set of circuit components would be laid out on a board (typically thick cardboard) in a frame (wood). Attached to the leads of the components are small metal springs. You used the provided wires to connect components together by bending the springs back, inserting the stripped ends of the wires between the coils of the spring, and letting the spring snap back into place. Instructions provided with the kit showed you how to connect the components to yield all sorts of interesting things, from simple circuits that could make lights blink to working radio receivers, musical instruments, etc. Some of the more sophisticated and expensive ones had ICs, and I think a few of the later ones had microcontrollers.