Sannadkii 1960-kii, wiilka, Bob Gore waxa uu daah-furay sida PTFE loogu beddelo xuub adag, dalool, la hagaajin karo isaga oo u beddelay ePTFE. PTFE iyo ePTFE waa isku mid kiimikaad ahaan, laakiin nooca la ballaariyay waxaa lagu samayn karaa daldaloolo cabbirro kala duwan leh, aad buuna uga cufan yahay, sidaa darteed sifooyinkiisa makaanikada waa ...
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