Type: Mark
Location: One face of nozzle
Inscription: Stamped incuse: "National" (in script) / "Cutting and welding equipment/ MFC. BY/ National Welding Equipment Co. San Francisco, CAL/PATENT 1835215/N-4"
Type: Mark
Location: On pipe
Inscription: "AIR" and "GAS" "NO. 8C", "DENTAL MFG CO/BUFFALO, NY"
Type: Mark
Location: On pipe