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Based on the provided knowledge fragments, there's no specific information available regarding special features of the keys for the eufy C210 Smart Lock that prevent the owner from making duplicates. The lock offers other advanced security features, such as a built-in protection circuit and compliance with anti-electromagnetism standards (BHMA A156.25 / UL 1034) for enhanced security. However, details about whether the keys have such duplicate prevention features are not mentioned.
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