Projectiles or missiles specially adapted for projection without use of explosive or

Official title: Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns (for delivering hypodermic charges F42B12/54; projectiles or missiles incorporating springs as the projecting means F41B7/02; {Arrows or darts for dispensing materials, for producing chemical or physical reaction, or for signalling F42B12/362})

F42B6/00 (Projectiles or missiles specially adapted for projection without use of explosive or) appears on 1,499 US grants and 1,078 published applications in this corpus.