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Today I have three pieces that look like lumps of iron.

This is a "Uji-doko" (backing metal) used in forging. It was covered in rust, but we polished it off and applied beeswax and polished it up.
U-shaped base (backing metal)
U-shaped base (backing metal)

It is a 2.4cm x 2.4cm square piece of iron. I wonder how it was used. The plating on the surface has peeled off in just the right way.
Iron square bar
Iron square bar

I've looked into it in various ways, but I couldn't find anything. It's just under 50cm long and weighs just under 17kg, so I think it might be a part of heavy machinery.
U-shaped member
U-shaped member