Mu 1747, injiniya wa ku France François Freneau anapanga chovala chamvula choyamba padziko lapansi.Anagwiritsa ntchito latex yotengedwa kuchokera kumatabwa a rabara, ndikuyika nsapato za nsalu ndi malaya mu njira ya latex yoviika ndi yopaka mankhwala, ndiye kuti imagwira ntchito yoletsa madzi.Mu fakitale ina ya labala ku Scotland, England, ...
Werengani zambiri