Inside the back of the board is a metal frame. The frame has hinges on one side and a latch to keep it closed on the other side. At the top of the frame is some kind of terminal, and little metal boxes covering relays and coils are below.
Here are some close-ups of the terminal.
Here are some close-ups of the boxes covering the relays and coils.
And here is the back of the frame (after opening) where the coils and relays are wired up. What a mess!
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