General Electric AR-1 / W1A - The Vintage Technology Association
GE-HA3 Helium Argon bulb
Argon; Ar: http://www.lenntech.com/periodic/elements/ar.htm | Argon, Noble gas, Pure products
EL0037 – Thorium-Argon bulb | Shelyak Instruments
Why is there gas inside a bulb? - Quora
GEC 60W SLI/H linear sodium lamp in various stages of warm up. The purple colour is from the neon-argon-xenon fill gas, the yellow is from sodium Stock Photo - Alamy