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stl deutschland electrical components refer to circuit boards, including: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, printed wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, heavy copper boards, impedance-controlled boards, PCB, ultra-thin printed wiring boards, ultra-thin circuit boards, and printed (copper etching technology) circuit boards. Circuit boards miniaturize and visualize circuits, playing a crucial role in the mass production of fixed circuits and optimizing appliance layouts. Circuit boards are also known as printed wiring boards or printed circuit boards. Flexible printed wiring boards and flexible circuit boards use polyimide