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US7152615B1
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Earthquake actuated horizontal valve with micro switch
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USRE38220E
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Earthquake actuated automatic gas shutoff valve
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Automatic safety shutoff valve
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Seismic initiator for earthquake shutoff valves and the like
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Automatic safety shutoff valve
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Intergrating, indicating, and controlling seismometer
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Earthquake displacement recorder
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Seismic displacement recorder for base-isolated structures
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Peak accelerograph
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Passive multielement shock recorder
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Peak-recording accelerometer
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Peak accelerograph
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Instrument and method for recording mechanical transients
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