曹宏

Direct-actuated three position switch

王岩, 徐斌, 李东明, 2002 .

Vacuum extinction chamber for epoxy resin seal pole

鲁晓东, 曹宏, 2001 .

Cleaning device of garbage on ground

薛俊, 曹宏, 王学华, 2010 .

Crawler-type automatic ground sweeping device

薛俊, 曹宏, 王学华, 2010 .