| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| SJ/Z 9142.4-1987 | English | 199 |
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Days<=3
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Minimum performance requirement for high fidelity audio equipment Part 4 Magnetic recording and reproducing equipment
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SJ/Z 9142.4-1987
| Obsolete |
SJ/Z 9142.4-1987
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