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• Patent certificate of polytetrafluoroethylene composite film with air purification function
• Patent certificate of polytetrafluoroethylene anti-haze window screen
• Patent certificate of medical filter element
• Patent certificate of industrial filter bag
• Patent certificate of a new type of rubber composite film
• Patent certificate of a new type of hot-pressed composite film
• Patent certificate of a longitudinal stretching mechanism
• A patent certificate for a composite film