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  1.  

    Adjustable stool used for teaching

    QIU YAN | Europäisches Patentamt | 2018
  2.  

    Multifunctional desk for Chinese education

    QIU YAN | Europäisches Patentamt | 2018
  3.  

    Adjustable desk for teaching

    QIU YAN | Europäisches Patentamt | 2018
  4.  

    Interesting-type operation device for teaching

    QIU YAN | Europäisches Patentamt | 2018
  5.  

    FLUID FLOW CONTROL DEVICE HAVING A PARTICLE CATCHER

    QIU YAN | Europäisches Patentamt | 2017
  6.  

    FLUID FLOW CONTROL DEVICE HAVING A PARTICLE CATCHER

    QIU YAN | Europäisches Patentamt | 2017
  7.  

    Fluid flow control device having a particle catcher

    QIU YAN | Europäisches Patentamt | 2017
  8.  

    Fluid Flow Control Device Having a Particle Catcher

    QIU YAN | Europäisches Patentamt | 2018
  9.  

    Demonstration board for English early education

    QIU YAN | Europäisches Patentamt | 2018
  10.  

    Agriculture pesticide spraying device

    QIU YAN | Europäisches Patentamt | 2016
  11.  

    Garden potting soil loosening device

    QIU YAN | Europäisches Patentamt | 2016
  12.  

    MULTI-CONE, MULTI-STAGE SPRAY NOZZLE

    QIU YAN | Europäisches Patentamt | 2016

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