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US4236041A
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Stereophonic signal indicating apparatus
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US3590942A
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Omnidirectional loudspeaker system
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US3668545A
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Apparatus for amplifier protection
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US3525049A
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Transistor amplifier simultaneous checking and protecting method and apparatus
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US3662113A
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Stereophonic demodulator apparatus and automatic monophonic-stereophonic switching circuit
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US3524995A
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Limiter apparatus
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US3525045A
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Apparatus for indicating tuning of frequency-modulated signal transmissions
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US3539729A
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Apparatus for reducing interference in the transmission of electric signals
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US3419811A
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Audio amplifier tone control system
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ES341421A1
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A transistor amplifier. (Machine-translation by Google Translate, not legally binding)
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ES341359A1
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Mixer and signal conversor device adapted for use in fm broadcasting receivers. (Machine-translation by Google Translate, not legally binding)
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US3348155A
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Oscillator-converter apparatus employing field effect transistor with neutralizationand square law operation
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US3348154A
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Signal mixing and conversion apparatus employing field effect transistor with squarelaw operation
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US3448385A
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Stereophonic receiver squelch apparatus
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US3299946A
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Mounting and heat sink device for electrical components
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US3296378A
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Monophonic-stereophonic automatic switching and demodulator circuit
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US3161727A
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Sterophonic-to-monophonic reception apparatus
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US3175040A
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Balanced stereophonic demodulator apparatus
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