I don't know if they built them, but they did have at least a few things that were designed by them, like those electronic percussion pads they used, which used an arrangement I've never seen anywhere else, where the drumsticks are part of the circuit.
I believe a lot of the stuff they used, if it wasn't designed or built by them, it was certainly customized by them. Same thing with Tangerine Dream, they used a lot of gear that was altered in one way or another.
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