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Even the new miras are based on the same design which must be over 40 years old.

More than 40 years the G72/722. Think they are 1960s & went right up to 1984 ish, then the plastic fronted 723 came out which had similar works. All credit to Mira, they last well & you can buy any parts.
 
We had a Leonard shower in our house when i was a kid (we were posh) much the same design as the 722 but a bit bigger. It had hot cold and tepid on it! I think my da nicked it from a school or somewhere.
 

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