| 摘要 |
The present invention pertains to a small, lightweight personal alert safety system which has a self-contained battery powered electrical and electronic circuit which is automatically activated when the breathing air SCBA is charged (pressurized) among other components, in a small casing for use by personnel working in dangerous environments, e.g., firefighters and rescue workers and the like. In the preferred embodiment, a pneumatic system is controlled by the air supply. The system cannot be turned off when the air supply is on. This safety feature insures that the firefighter is protected.
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