Using only a camera, a computer and a key-cutting machine, scientists have duplicated sets of keys after taking snaps of them from more than 60 metres away.
2
结果内凹齿钥匙开锁痕迹特征明显，且被钥匙机复制后能留下复制痕迹。
Result There are distinctive marks on concave keys when normally used and when used as guide keys.
3
方法制作内凹齿钥匙正常开锁和被钥匙机复制后的样本，用光学显微镜拍照固定痕迹特征。
Method Samples of manipulated keys and keys that used as guide in a duplication process are made. Marks and striations on the keys are photographed and analyzed by light microscopy.
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