A protective helmet, in particular safety helmet with a two-phase protective effect, be combined with a rigid shell.

• 1. 一种具有防护作用的化妆品外壳管 [P] . 中国专利： CN214649738U . 2021-11-09
• 2. 防护头盔、防护头盔部件和制造防护头盔的方法，包括具有可扩大的钟形开口的防护头盔 [P] . 中国专利： CN109414085A . 2019-03-01
• 3. Protective Helmets, Protective Helmet Components and Methods for Manufacturing Protective Helmets, Including Protective Helmets Having an Enlargeable Bell Opening [P] . 美国专利： US2019045875A1 . 2019-02-14

  机译： 防护头盔，防护头盔部件和制造防护头盔的方法，包括具有扩大钟形开口的防护头盔

• 4. Protective helmet, protective helmet component, and method of manufacturing a protective helmet including a protective helmet having an expandable bell opening [P] . 日本专利： JP2019504940A . 2019-02-21

  机译： 防护头盔，防护头盔部件以及包括具有可扩展钟形开口的防护头盔的防护头盔的制造方法

• 5. PROTECTIVE HELMETS, PROTECTIVE HELMET COMPONENTS AND METHODS FOR MANUFACTURING PROTECTIVE HELMETS, INCLUDING PROTECTIVE HELMETS HAVING AN ENLARGEABLE BELL OPENING [P] . 欧洲知识产权局专利： EP3413738A4 . 2019-09-25

  机译： 防护头盔，防护头盔组件和制造防护头盔的方法，包括具有扩大的开口的防护头盔

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• 1. Helmet-based noninvasive ventilation for acute exacerbation of chronic obstructive pulmonary disease: A case report [J] . Mi Hwa Park ,Min Jeong Kim ,Ah Jin Kim . 世界临床病例杂志 . 2020,第010期
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