Well, there's the old dark brown epoxy boards, and then there's the light-grey fiberglass one's, for awhile we had the Phenolic circuit boards and rumor has it, they are still used, and now we have the boards that have the dark green solder-mask painted on them so we can't really see what they are made of, all this plus the circuit chips results in hardware integration, but of course, I could be wrong.
 

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