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:[[Project:PCB_Etch_Tank]] A proposal to build a spray etch tank | :[[Project:PCB_Etch_Tank]] A proposal to build a spray etch tank | ||
:[http://en.wikipedia.org/wiki/Polychlorinated_biphenyl Polychlorinated Biphenyl] a transformer cooling fluid now deprecated due to environmental concerns | :[http://en.wikipedia.org/wiki/Polychlorinated_biphenyl Polychlorinated Biphenyl] a transformer cooling fluid now deprecated due to environmental concerns | ||
[[Category:PCB etching]] |