Yes, I have heard of these multiple SIMM extensions. They seemed to be quite popular (for that read advertised heavily) at the time when late 486's and early Pentiums were sold with 4 Mb SIMMs. After a couple of upgrades, replacing 4 Mb SIMMs with 32 Mb SIMMs, these products supposedly provided a way to make use of your spare 4 Mb SIMMs, e.g., stack 4 of them in a single SIMM slot.
However, they didn't always work; it seemed to depend on your mainboard chipset and BIOS. They rapidly fell out of favour. You might find some in on-line auction houses but don't pay much for them as they may not work.
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