Chalk box for education and teaching convenient to clearance
The utility model provides a chalk box for education and teaching convenient to clearance relates to the teaching equipment field. This chalk box for education and teaching convenient to clearance, including work box and chalk placing box, chalk placing box's bottom is run through the work box...
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Main Author | |
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Format | Patent |
Language | Chinese English |
Published |
19.10.2018
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Subjects | |
Online Access | Get full text |
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