Uthango Lwesikhashana lwaseMelika

Uthango lokwakha lwesikhashana olujwayelekile lwase-US luwumgoqo wensimbi oguquguqukayo osetshenziswa ezweni lonke elase-United States. Ihlangabezana namazinga we-ASTM futhi yakhelwe ukumelana nezimo zezulu eziyinkimbinkimbi kulo lonke elase-America, njengesifutho sikasawoti osogwini, ukuchayeka okuqinile kwezinga lokushisa eliphezulu eNingizimu, kanye nemimoya enamandla kanye neziphepho zeqhwa eMidwest. Isetshenziswa kabanzi ezindaweni zokwakha