There’s a mention of IBM’s SLD modules in this thread from TubeTime:
IBM developed this technology in the early 1960s for their System/360 computers. these are SLD (solid logic dense) modules from that program.
TubeTime posted an index to their most notable twitter threads, including many Tube/Valve and RetroComputing items, as well as Homebrew Hardware, mechanical cross-sections, and more.
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