| 摘要 |
A low power siren having a high power sound and good tonal pattern. The siren consists of a casing with a motor and shaft protruding into a second casing. The inlet into the second casing allows for the passage of air, passing a rotor. Air cutters around the rotor merge with ribs which connect with a hub which is connected to the shaft. Air drawn through the inlet by rotation of the rotor passes the air cutters producing a noise.
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