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Amputation sites I think? The suction attracts blood flow to the area and supports healing/retention of blood vessels… I think. Neither one of us clearly can be bothered googling but that’s what I recall…
google makes things too easy. great thinks were thunked back in the day where people had nothing but their own minds to consult.
And bad thunks are thinked just as much now as then. Truly the worst of times