Kev sib ntaus sib tua ntev ntev dhau los ntawm kev liam tias lub pob ntseg tsis zoo ua los ntawm 3M tau tshwm sim tom qab lub tuam txhab pib sib cav sib ceg rau tus neeg sib tw me, cov ntaub ntawv hauv tsev hais plaub tau qhia.
3M txoj kev siv zog los tiv thaiv nws cov tub rog earplug lag luam thaum kawg tau coj 3M kom nres kev xa khoom ntawm ib tus qauv ntawm pob ntseg, thiab ua rau muaj kev sib foob ntau xyoo, ntau lab nyiaj daus las hauv cov nqi thiab muaj peev xwm ntau lab nyiaj rau Minnesota-based manufacturing loj heev, raws li cov ntaub ntawv hauv tsev hais plaub thiab cov tuam txhab kev sib txuas lus tau nthuav tawm thaum lub sij hawm sib foob. 3M tau hais tias nws tau tswj hwm nws txoj cai patent hauv kev ua nws foob rau nws cov neeg sib tw.
Tau qhov twg los: https://www.wsj.com/articles/3m-earplugs-fight-stems-from-self-made-legal-battle-11658156756?siteid=yhoof2&yptr=yahoo