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Portable aftershock alarm apparatus for earthquake salvation scene
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Pendulum and spring ram public earthquake alarm for city and town
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Large picture inscribed board type dual stage alarm for earthquake in public place
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Sphere off-position and falling into span insulation slot ceiling lamp shaped earthquake approach alarm
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Vertical rod hammer type sphere swinging off-position wall lamp shaped earthquake approach alarm
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Spring-top-counter sphere dislocation type automatic conveyer for earthquake level signal
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Pendulum mass and inverse ratio rod impending-earthquake alerting signal automatic spreading and propagation controller
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Alarm capable of sending out multi-grade earthquake signal to periphery towns
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Pendulum and inversing bar type town public earthquake automatic alarm system
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Countryside-city-shared public impending earthquake automatic alarm system capable of recording magnitude and giving off multiple grades
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Automatic controller for transmitting impending earthquake signals toward peripheral towns
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System capable of automatically transmitting impending earthquake alarm signals toward towns outwards
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Alarm capable of automatically transmitting impending earthquake signals toward peripheral towns
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The vertical spring hammer type cylindrical wall lamp shaped earthquake alarm
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Poling hammer type cylinder wall lamp-shaped impending earthquake alarm
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Drop hammer type cylinder wall lamp shaped earthquake alarm
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Lamp shaped wall mounted impending earthquake alarm with a long bar inserted in pendulum
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horizontal connecting bar hammer with wobbling stick coffered light panel shaped impending earthquake doublestage alarm
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Drop hammer shaking contact type ceiling lamp shaped impending-earthquake alarm
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Horizontal celling lamp shaped earthquake alarm with elastic linking rod hammer
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