Periods
Charles Ducas patentsPaul Eisler develops the first printed circuit boardEisler patents a more advanced PCB designUSA and Britain military work on PCB development for use in WWIIUSA Army publicly releases PCB technologyTransistors introduced to the electronics marketPCBs are developed into double-sided versionsSilicon chips were introduced into electronic designsSurface mount technology (SMT) is developedSoldermasks make production xeasierPCBs' size still continues to decrease and they become more multilayered.PCBs continually decrease in size
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