US2429357A - Hypodermic needle sharpener - Google …
In a machine for sharpening hypodermic needles having a tubular shank, means for holding the needles in the desired relation to the sharpening device comprising a carrier formed with an arbor adapted to enter the shank, a spring clamp mounted on the carrier and adapted to engage the interior of the shank and retain it on the arbor, and a ...