Lub hauv paus chiv keeb ntawm yoog raws PCBs (FPC) Cov keeb kwm ntawm cov khoom siv hluav taws xob hloov tau yooj yim tuaj yeem taug qab rov qab mus rau xyoo 1960, thaum NASA pib tshawb fawb ntawm lub dav hlau xa tib neeg mus rau lub hli. Txhawm rau hloov mus rau qhov chaw me me ntawm lub dav hlau, qhov kub thiab txias, av noo thiab muaj zog vibration ib puag ncig, ...
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