back in the late 80's i was working for a company that built prototypes and automated test fixtures. one of our projects was for a military contractor, and i suspect that it was an etching tank, but i'm not sure. it was made with a solid block of aluminum, about 10"x15"x15" milled out to form a tank. the aluminum was finished with a hard-shell black anodized finish that had some teflon in the formulation, so it was chemically inert, and the finish was so hard that it couldn't be dented with a hammer and was VERY scratch resistant. our job was to install the heater elements in holes bored into the base parallel with the bottom. the whole thing was mounted on a wobbler table and an electronic temperature regulator and motor speed control in the wobbler chassis. whether for mixing chemicals, cleaning or for etching, these (we made 3 of them) beasts were expensive for whatever they were made for.
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