Continous observations of the propagation delay variation of BPM standard time signal were carried out in real time at Wuhan Ionospheric Observatory by a digital display system.
利用新研制的短波传播时延实时数字显示系统，在武汉电离层观象台对BPM时号的传播时延进行了长时间连续观测。
The main product is printer ink, continous ink supply system. Some products passed patent right application in 2005-2007.
主要经营打印机耗材，打印连续供应墨水系统，2005-2007年产品申请国家产品专利成功。
The main product is printer ink, continous ink supply system. Some products passed patent right application in 2005-2007.
主要经营打印机耗材，打印连续供应墨水系统，2005-2007年产品申请国家产品专利成功。
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