In some coolers the cooling surfaces consist of direct-expansion pipes placed in clusters of convenient form; in others brine pipes are used; in others there is a shower of cold brine, and in some cases combinations of cold pipes and brine showers.
Mechanical coolers used in space are generally based upon a linear compressor with clearance seals.
Some people fit extra oil coolers to the gearbox.
Another major consideration is the sustainability of mains-fed coolers.
I have engraved on anything from tot measures; goblets and champagne coolers to windows; mirrors and sliding doors.