| 主权项 |
1. A gas flow alarm, comprising:
a main barrel with a proximal end and a distal end, wherein the main barrel defines a gas flow direction from the proximal end to the distal end; a cap slidingly disposed on the main barrel between a proximal position and a distal position, wherein the proximal position of the cap defines a compressed condition of the gas flow alarm and the distal position of the cap defines an expanded condition of the gas flow alarm; and a noise generating device disposed within the main barrel, wherein the noise generating device is adapted to generate noise from the gas flow when the gas flow alarm is in the expanded condition. |
