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Riot shields could scatter crowds with 'wall of sound'
Shields that emit low-frequency pressures waves to hamper breathing would disperse crowds safely, a new patent claims
Shields that emit low-frequency pressures waves to hamper breathing would disperse crowds safely, a new patent claims
Source: New Scientist
Posted on: Wednesday, Dec 14, 2011, 8:15am
Views: 1035
Posted on: Wednesday, Dec 14, 2011, 8:15am
Views: 1035
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