JJD muaj ntau tshaj 30-xyoos kev ua haujlwm hauv tooj dag / aluminium / zinc foundry manufacturing tsom mus rau raws li cov neeg siv khoom cov kev xav tau nrog tus nqi zoo. Peb tso siab rau peb cov khoom tsim kev paub tab thiab xav nrog peb cov khoom zoo thiab kev ntseeg siab. Ib qho chaw nres tsheb yog muab cov pwm tsim, ua lub siab casting / tsis tshua muaj siab casting / nqus casting, lub tshuab npliag, kua / hmoov txheej thiab sib dhos.