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I am busy salvaging circuit boards while my mind resets and a new idea for a build takes form. Yesterday I disassembled a circuit board from a Planmeca X-Ray machine (a company from Finland) that dated from the 1990s. Among the salvaged components were a few that looked like this:        I have seen something similar in other equipment that was packaged in brown ceramic but this is the first time I have come across this style. I believe I even knew the name of this type of ...