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Priority to JP5138984UpriorityCriticalpatent/JPS60163368U/ja
Publication of JPS60163368UpublicationCriticalpatent/JPS60163368U/ja
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Publication of JPH0518701Y2publicationCriticalpatent/JPH0518701Y2/ja
Method for detecting and checking the decreasing of activity and watchfulness level of driver on vehicles on non-limited way having independent source of power as well as safety device for vehicles of non-limited way