Exercise book convenient to read and read
The utility model discloses an exercise book convenient to read, which structurally comprises an outer page, stitches and an inner page, the inner page is sewn on the inner surface of the outer page through the stitches, the outer page comprises a marking layer, a bonding layer, a coating layer and...
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Format: | Patent |
Sprache: | chi ; eng |
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Online-Zugang: | Volltext bestellen |
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