A: Charles Hunter and Charles Gabriel Pravaz were revolutionary physicians during the nineteenth century who independently designed and popularized using hollow needles for injecting drugs instantly into the human body. Their function laid the muse for modern hypodermic needle technological know-how. A: Needle gauge measurements refer to the outer diameter https://prx-t33-163951.tnpwiki.com/6575506/filorga_nctf_135ha_copyright_an_overview