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What are the things in the tub? Those aren't shower curtain rings.

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Monarc bath tub.

(I don't know how to link to it)

I can't remember if someone had told me what they were, or if I read it somewhere else.

But I think they were some sort of ceramic disc's.  I know there were more around the site.

I'm sure someone else knows exactly what they are and what they were used for.

They kind of look like they might be milling stones for grinding corn or grain.