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Thank you so much. I am very delighted receiving your reply :-) My deepest gratitude to you, Dr Guy Kuo for your precious, detailed explanation and again for your invaluable life-saving invention!
Hi, Dr Guy Kuo, I am truly grateful for your kindness to share your amazing work. May I ask why the design of PAPR of certain brand such as 3M has no expiratory port while the port is important? Thank you.