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== Overview ==
Chinese CNC press brake controller.
== Online Resources ==
[http://en.estun.com/ ESTUN Practitioner of China SMART Manufacturing] (English homepage)
[http://www.estun.com/ 埃斯顿自动化 - ESTUN] (Chinese homepage)
[http://en.estun.com/upimages/8fb6534b-461f-46b8-b1e2-886b59ad7f68.pdf E21 Installation Manual (Version: V1.09)]
[http://en.estun.com/upimages/f56c3dfd-0027-45e2-ad7e-bd994ed31057.pdf E21 Operation Manual (Version: V1.04)]