Automatic dust-free blackboard

An automatic dust-free blackboard comprises a mounting face plate, rectangular or square mounting grooves are formed in the mounting face plate, a left blackboard body and a right blackboard body are arranged in the mounting grooves in a staggered sliding mode, a sliding piece is arranged on one sid...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	DUAN JIE, YANG CHENG, LIU XI'NENG, ZHOU WEN, YUE SIQI
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES FOR WRITING OR DRAWING ARTICLES FOR WRITING OR DRAWING UPON BUREAU ACCESSORIES PERFORMING OPERATIONS TRANSPORTING WRITING OR DRAWING IMPLEMENTS
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