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Kufotokozera Kwathunthu kwa Zida za TPU
Mu 1958, Goodrich Chemical Company (yomwe tsopano ikutchedwa Lubrizol) inalembetsa mtundu wa TPU Estane koyamba. Pazaka 40 zapitazi, pakhala pali mayina opitilira 20 padziko lonse lapansi, ndipo mtundu uliwonse uli ndi zinthu zingapo. Pakadali pano, opanga zinthu za TPU akuphatikizapo ...Werengani zambiri
