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“Ram” not “RAM”.
I was disappointed, because actual Hydraulic RAM does exist https://en.wikipedia.org/wiki/Delay_line_memory (using Wikipedia's own definition of Hydraulics as "involving the mechanical properties and use of liquids").

My thesis advisor - some years ago - worked on one of these systems, CSIRAC, many years earlier when he himself was a student.

back in the day we used to tap the hydraulic ram's acoustic output as a source of entropy