Carbon tetrachloride (CTC) — a colorless liquid that vaporizes and smothers electrical and small liquid fires
Or foam-forming chemicals — for grease or oil fires
⚠️ Today, we know CTC is toxic and ozone-depleting — so these are not safe to use now.
But in the 1920s–1950s?
It was cutting-edge fire tech.
🏛️ A Symbol of a Bygone Era
These extinguishers were everywhere:
Hotels
Trains
Office buildings