| 摘要 |
<p>The second stage of the regulator comprises a first airflow circuit, controlled by a manostat diaphragm in a conventional manner which permits the assumption of the minimum required amount of air upon each act of breathing, with a minimum effort; and a second airflow circuit combined with said first circuit, which permits to supply-in case of increased demand of air-a supplementary amount of air to meet any additional need of the user.</p> |
