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Guys, help me out. I'm trying to find a specific I remember having as a kid, and I can find no info on it, maybe I'm just stupid and don't know what keywords to use.
It was a fairly normal brick, but it had a horizontal indent/slit along its width, one just big enough that a rail like pic related would fit inside and could slide back and forth.
Would somebody be able to get me a name/number?