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peephole
  A peephole is a small opening through which one may look. In a door, a peephole allows people inside the security of seeing outside without opening the door. Glass peepholes are often fitted with a fisheye lens to allow a wider field of view from the inside and little to no visibility from the outside.〔 (Peephole Is One Way Viewer ) ''Popular Science'', July 1950, pg 153, right-side〕 ==References==
   
 
  抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「peephole」の詳細全文を読む
 
 
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