Circuit Etching

https://archive.org/details/radio_electronics_1987-06/page/n68/ https://ars.electronica.art/hope/en/clay-pcb/ https://tech.lgbt/@nina_kali_nina/112620174104886147 https://issues.chromium.org/issues/336399264 from Asianometry "why was Japan so good at semiconductors?", in '80s Japan invested more in developing semi manufacturing than steel