A process for the preparation of a breath protection half mask made of foamed latex and they are prepared in accordance with this method of protecting half mask

• 1. 一种呼吸机呼吸面罩用泡沫敷料及其制备方法 [P] . 中国专利： CN112057720A . 2020-12-11
• 2. 一种可吸收渗出液的降温半脸保护面罩 [P] . 中国专利： CN213156886U . 2021-05-11
• 3. A method for producing a breath protection half mask made of foamed latex [P] . 德国专利： DE691757C . 1940-06-05

  机译： 一种由泡沫乳胶制成的呼吸防护半面罩的生产方法

• 4. Breath protection half mask made of foamed latex [P] . 德国专利： DE666690C . 1938-10-26

  机译： 泡沫乳胶制成的呼吸保护半面罩

• 5. Breath protection half mask made of foamed latex [P] . 德国专利： DE628919C . 1936-04-18

  机译： 泡沫乳胶制成的呼吸保护半面罩

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• 6. Study Protocol for Determination of an Assigned Protection Factor for Negative-Pressure Half-Mask High-Efficiency Respirators Using a Simulated Health-Care Workplace Test [R] . Coffey, C. C. 1994

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