| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD 121-1977 | English | 919 |
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Days<=6
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(Rectangular and flat torch-shaped waveguide flanges)
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YD 121-1977
| Obsolete |
YD 121-1977
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