General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 11449.4-1989
Scope
This standard applies to circular waveguide flanges. It is part of a complete set of waveguide flange standards and should be used in conjunction with GB 11449.1 "Waveguide Flanges Part 1: General Requirements".
GB/T 11449.4-1989 history
1989GB/T 11449.4-1989 Flanges for waveguides--Part 4:Relevant specification for flanges for circular waveguides