Gas blowpipes and torches for welding, cutting, scarfing, gouging, hardening, cleaning, shaping, heating and treating metal and for removing surface defects on metal and for altering internal stresses in metal; machines and apparatus, employing gas blowpipes and torches, for the aforesaid purposes; regulators, manifolds and distribution systems for controlling the flow of gases, and igniting devices for gas blowpipes and torches. Gas generators,

Acetylene gas welding and cutting blowpipes, blowpipes or torches used in welding or allied processes,