Attenuation of the electro-acoustic efficiency of telephone sets in view of protection against acoustic shocks |
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Citation: |
https://handle.itu.int/11.1002/1000/8033 |
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Approval date: |
1980-11-21 |
Approval process: | WTSA |
Status: |
Superseded |
Maintenance responsibility: |
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Further details: |
Patent statement(s)
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