antique illustration of scientific discoveries: fireplaces, stoves, heaters and chimneys - 氣閥 幅插畫檔、美工圖案、卡通及圖標
antique illustration, applied mechanics: steam powered machines, steam pressure valve - 氣閥 幅插畫檔、美工圖案、卡通及圖標
industrial history, argand steam blower, used in a furnace for burning anthracite culm, victorian, 1890s, vintage illustration 19th century - 氣閥 幅插畫檔、美工圖案、卡通及圖標
kraft bags, coffee bags, empty ziplock bags, plastic ziplock bags, isometric vector - 氣閥 幅插畫檔、美工圖案、卡通及圖標矢量圖
"condensation water drain" (ball float steam trap), a classic mechanical design used to automatically remove condensate from steam-carrying pipes or vessels - 氣閥 幅插畫檔、美工圖案、卡通及圖標