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Asttar Zyx45 (A) Reusable 45 Minutes Escape Respirator Compressed Oxygen Self Rescuer, Find Details and Price about Compressed Oxygen Self Rescuer Breathing Apparatus from Asttar Zyx45 (A) Reusable 45 Minutes Escape Respirator Compressed Oxygen Self Rescuer - Shaanxi Asttar Explosion-Proof Safety Technology Co., Ltd.