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Number of entries (Data is updated on a monthly basis): 83776
GB/T 17452-1998
Technical drawings--General principles of presentation--Sections and cuts
GB/T 14401-1993
公用陆地移动通信网（450 MHz频段）中移动台-基站-移动电话交换局之间的信令
Signalling between mobile station and base station and mobile services switching centre in public land mobile communication network at 450MHz band
GB/T 14024-1992
Limits and methods of measurement of radio interference characteristics of electric power plant with internal combustion engines--Conducted interference
Number of entries (Data is updated on a monthly basis): 83776