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It might be a bracket used to support or reinforce a shelf inside a cabinet. The slots could be for adjustable shelving or for securing the shelf in place. Hope this helps!
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Pretty sure it mostly covers a hole in a desk you put wires through.
Grommet cover.
Yup, knew I've seen it before. 30 years ago on metal desks. I think you're right
Haven’t seen a better answer come in so: Solved!
Desktop wiring port cover/filler?
Not part of a sewing machine?
That was what I was going to ask? it looks like a needle footing
It might be a bracket used to support or reinforce a shelf inside a cabinet. The slots could be for adjustable shelving or for securing the shelf in place. Hope this helps!