It is from an old LED display board.
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1A convenient place to install insulation-displacement connector. – glen_geek Sep 20 '22 at 13:47
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1Do the cables have connectors? Did you check if connectors are mounted on a slot area or non-slot area? – Justme Sep 20 '22 at 13:49
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1Also a convenient place to make solder connections to a PCB. – Andy aka Sep 20 '22 at 14:06
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As @glen_geek and @JustMe instantly pointed out, these slots are there to make it easy to attach a connector...
bigjosh
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