Monochrome graphics of gas mask. Illustration of a device used for protection of airborne pollutants.
Found at http://publicdomainvectors.org/en/free-clipart/Gas-mask-vector-clip-art/6116.html 防毒面具 gasmask、gas mask、Relief 防毒面具、防毒面具、浮雕 資料來源:openclipart ( https://openclipart.org/ )