1960s vaccination jet injector.
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Previously:
https://www.homemadetools.net/forum/...928#post206888
https://www.homemadetools.net/forum/...031#post207275
https://www.homemadetools.net/forum/...412#post192765
https://www.homemadetools.net/forum/...364#post188884
https://www.homemadetools.net/forum/...429#post181726