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GB1151719A
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Improvements in or relating to Stereophonic Pick-ups
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ES284026A1
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Improvements in the construction of stereophonic fonocaptors (Machine-translation by Google Translate, not legally binding)
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ES259363A1
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Improvements in the construction of stereophonic fonocaptors (Machine-translation by Google Translate, not legally binding)
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ES209490A1
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Apparatus for the transmission of mechanical vibrations (Machine-translation by Google Translate, not legally binding)
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CA645661A
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Piezo-electric pick up
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CA701976A
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Stereophonic pick-up
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CA709481A
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Transducer for use both in pick-ups and in track cutting means
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CA700169A
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Transducer for use both in pick-ups and in track cutting means
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CA778878A
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Stereophonic transducer
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CA700164A
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Stereophonic pick-up
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CA765482A
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Pick-up element
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CA506906A
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Apparatus for transmitting mechanical vibrations
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CA651132A
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Stereophonic pick-up
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CA537660A
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Filter for sound vibrations and a microphone and telephone provided therewith
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CA701963A
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Pick-up
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CA651133A
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Stereophonic pick-up
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