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世界上任何一个地方有相同技术的公开使用行为，申请获得专利的技术就会丧失新颖性，但审查员只能对现有的技术文献进行检索，对于在申请日之前公开使用，但尚未载入文献的技术，审查员是难以发现的，因此，即使在专利授权以后，还应当给予他人以申请宣告专利权无效的合理机会，以弥补审查中的错误。
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