门镜
门镜又称猫眼、防盜眼、防盜鏡,是一种能够通过小孔观察外部的小型光学仪器。安装在房门上,使得屋内的人无需开门就可以观察到屋外的情况,从而保证自身的安全。
参考资料
- Peephole Is One Way Viewer Popular Science, July 1950, pg 153, right-side
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