ES210309A1 - Improvements introduced in electronic amplifiers for the deaf (Machine-translation by Google Translate, not legally binding)
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Improvements introduced in electronic amplifiers for the deaf (Machine-translation by Google Translate, not legally binding)
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Improvements introduced in the electronic amplifiers for deaf people characterized by being provided with a microphone two voltage amplifying transistors and a third final amplifying transistor. (Machine-translation by Google Translate, not legally binding)
ES210309A1953-07-111953-07-11Improvements introduced in electronic amplifiers for the deaf (Machine-translation by Google Translate, not legally binding)
ExpiredES210309A1
(en)