Gushaka ubushakashatsi ku nyungu zo gukoresha 4140 Tubing idafite ibice mu Kubaka Imbonerahamwe yibikoresho 1. Intangiriro kuri 4140 Seam Tubing 2. Ibintu byingenzi byingenzi bya 4140 Tubing idafite ibice 3. Porogaramu ya 4140 Inyungu zidafite uburenganzira mubwubatsi 4. Inyungu zo gukoresha 411 40 Imbaraga zidasanzwe 4.1 Imbaraga zidasanzwe nuburambe 4.2 Ingaruka-ingirakamaro mububiko