| Jet injectors have been available for many applications for a long time. Over the course of time they have not proven popular for a variety of reasons as the last respondent mentioned, dosing and convenience, and the fact that they hurt too much. Needles are cheap, and effective, and they don't hurt enough to reinvent the wheel.
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Wildbill "I am wounded,
but not slain.
I will lay me down to rest awhile,
then rise and fight again".
Sir Andrew Barton
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