Cov Cim Npe Khoom
Cov rivets dig muag nrov vim lawv teeb tsa sai thiab yooj yim; lawv tsim cov khoom siv ruaj khov (yog tias lub mandrel tawg, lub rivet tau teeb tsa kom raug); lawv tiv taus kev co thiab kev cuam tshuam; thiab cov rivets thiab cov cuab yeej teeb tsa tsis ua rau puas rau ntawm cov khoom siv uas tau koom ua ke.
Ntim & Xa Khoom
