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This is the interior of an Electro Products Labs un-regulated DC power supply, probably from the 1940s.

What are these square pieces attached to the interior of the case? Total of 4, wired in serial after the transformer.

20250715_184943.jpg

I believe they're a 4-plate selenium bridge rectifier, just installed in a way I haven't seen before. Looking for confirmation or disabuse.

Thx
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