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@Zdenek_Formanek_Prague
Thank you for this pic. I googled "carbitubo", haha, it is patent of GILBERTO COLOMBO (Trafiltubi srl manufacture, producer of Columbus tubes, and GILCO designes), used with steel frame, Ernesto used this technology for steel frames too, and 1989 producing CARBITUBO (ALANized Colnago). I recommending VERY NICE TRAFILTUBI,GILCO,COLUMBUS web pages. Real porno... I like Italian design. Innovative, modern, and easy...
http://www.trafiltubi.com/doc/eng/chisiamo2.htm