覗き眼鏡
  覗眼鏡
  irregular okurigana usage
  のぞきめがね
  noun (common) (futsuumeishi)
  see: 覗き機関・のぞきからくり
  peep show
  device with lens mounted on a stand or in a box to view enlarged pictures
  see: 箱眼鏡・はこめがね
  water glass
  hydroscope
  box, etc. with glass bottom for viewing underwater
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