Coal mine safety sign is horse, explosion-proof sign is Ex, and Lao An sign is one. This sign takes the shape of an ancient shield, meaning "protection". The letter "LA" in the middle of the shield means "labor safety". Three. "xx-xx-xxxxxx" is the number of the logo. The numbering method consists of three layers: numbers and letters. The two digits on the first floor represent the year when the mark was authorized; The two digits on the second floor represent the division code of the provincial administrative region to which the manufacturer authorized to use the logo belongs (imported products, and the code on the second floor indicates the country code of origin of the imported products with two English abbreviations); The first three digits of the third layer code represent the product name code, and the last three digits represent the order of identification authorization. 4. According to the regulations of safety color (GB 2893-200 1), the sign frame, protective cover and "safety protection" are green, "LA" and background are white, and the sign number is black. V. Marking specifications and scope of application: 1. Welding goggles, welding face mask and anti-impact eye protection: 18mm (including serial number) x 12mm (as shown in figure 1) 2. Safety helmet, dust mask, filter gas mask, filter gas mask cylinder (box), self-contained air respirator, long tube mask: 27mm (including serial number) x 18mm (as shown in Figure 2). 3. Flame-retardant protective clothing, acid-resistant work clothes, antistatic work clothes, antistatic, conductive shoes, toe protection shoes, rubber-covered safety shoes, acid-resistant leather shoes, acid-resistant rubber boots, acid-resistant plastic film pressure boots, puncture-resistant shoes and electrical insulation shoes: 69mm (inclusive).