I remember them, Military used them in my day.
They didn't have a needle though, the vaccine got shot out at high pressure in a jet that shot below the skin. Looked like a big mosquito bite when done.
Apparently the stopped using them from fear of cross contamination anyway.

"PED-O-JET" | Science Museum Group Collection
Multidose Jet Injection Apparatus, known as "PED-O-JET", hydraulically powered, with carrying case, by Scientific Equipment Manufacturing Corp, New York, U.S.A., 1970-1975

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