for the elderly breathing valve mask anti flying

for the elderly breathing valve mask anti flying
  • Ministry of Commerce of the P.R.China China Commodity Net

    Feeding and discharging through pneumatic three way valve constantly open and close to complete, while the gas valve is opened and closed by the control center to control. 3 wear a mask, wear earplugs and protective glasses and other protective equipment. faster and stronger anti interference ability of micro processing, with automatic