In a label printer, a top cover made of transparent resin is attached to a housing at a rear upper edge to cover a roll sheet holder storage part and to be freely opened and closed. A roll sheet of a roll sheet holder removably mounted in the roll sheet holder storage part is visible through the transparent resinous top cover. The roll sheet is provided with a plurality of medium information marks by printing. The medium information marks are visible through the top cover.


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> Method and apparatus for recording hologram, method and apparatus for reproducing hologram, and information retaining body

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