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What brand of oxygen generator is better?

No organization or institution has commented on the top ten brands of oxygen inhalers in China. The brands of oxygen inhalers can be introduced as follows:

Invicon: It's a better brand in America, and the price is higher. Produced in Suzhou Free Trade Zone, with medical device registration certificate.

Song Xin: The small oxygen machine is produced by Shenyang Song Xin Medical Company. It is a good brand in China and has a medical device registration certificate.

Turtle: produced by Shenyang Changtai Medical Company, small oxygen machine, a good brand in China, with medical device registration certificate.

Longfei: Zhejiang Longfei Group,

Have a medical device registration certificate.

Panasonic: No medical device registration certificate.

Yu Yue: produced by Jiangsu Yuyue Medical Company,

Its mercury sphygmomanometer is a well-known brand in China, and its oxygen machine has a medical device registration certificate.

Hangyang:

It produces industrial oxygen generators.

Su Yang: It produces industrial oxygen generators.

Ocean House: No medical device registration certificate.

Anaerobic electronic oxygen generator: no medical registration certificate.

Lu Shen: Made in Beijing, with medical device registration certificate.