Revision indicator for air purifiers.

• 1. 指示器，空气净化器以及指示空气净化器状态的方法 [P] . 中国专利： CN108286749A . 2018-07-17
• 2. 包括空气过滤器寿命指示器的空气净化器和用于确定空气过滤器的寿命的方法 [P] . 中国专利： CN108700316B . 2021.05.04
• 3. A revision indicator for air purifyers. (Machine-translation by Google Translate, not legally binding) [P] . ES350712A1 . 1969-05-01

  机译： 空气净化器的修订指示器。 （通过Google翻译进行机器翻译，没有法律约束力）

• 4. bottle ejector mechanism for air purifiers. [P] . ES2330044T3 . 2009-12-03

  机译： 空气净化器的瓶子弹出装置。

• 5. Indoor air purifiers. [P] . 德国专利： DE69006381T2 . 1994-05-11

  机译： 室内空气净化器。

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