Proper shop fire extinguishers

What is the type of extiguisher they used to keep all over (foolishly at kid's level) around department stores back in the 70s?

They were big metal things, sometimes with neat gages and official-looking embossed writing on the cans.

(I, being a kid at the time, thought they were pretty cool. I think I was about 7 or 8, standing in some interminable line in a Sears or Montgomery Ward with my mom when I innocently pulled, pushed or squeezed something on one of those babies and the thing blasted the woman behind us. There was some fuss about the condition of her dress, as I remember.)
 
Do not ever use AFFF(foam) or water in an area where electricity is present. It can KILL you. Stay with ABC dry chemical. The mess is a lot easier to clean than a burned building.
 
When I went To school,they had those soda-acid extinguishers ( they had just replaced the sand buckets). You turned them upside down and struck the top on the floor. It broke the acid vial in the soda water tank and sprayed foam all over the place. The other old standard was CO2.I have a small collection of antique fire extinguishers. My favorite is one that was filled with Carbon Tetra-chloride (now a banned chemical).The photo is of two neat ones. The bottom one is the pump type Carbon-Tet unit.
 
When I went To school,they had those soda-acid extinguishers ( they had just replaced the sand buckets). You turned them upside down and struck the top on the floor. It broke the acid vial in the soda water tank and sprayed foam all over the place. The other old standard was CO2.I have a small collection of antique fire extinguishers. My favorite is one that was filled with Carbon Tetra-chloride (now a banned chemical).The photo is of two neat ones. The bottom one is the pump type Carbon-Tet unit.
 
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