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The test methods for 3-channel open wire carrier telephone equipment
Translate name
STANDARD published on 1.1.1984
Designation standards: GB/T 4770.1-1984
Note: WITHDRAWN
Publication date standards: 1.1.1984
SKU: NS-1231464
Country: Chinese technical standard
Category: Technical standards GB
Latest update: 2026-02-03 (Number of items: 2 259 855)
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