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Individual
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Individual
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Priority to ES0201412ApriorityCriticalpatent/ES201412A3/en
Publication of ES201412A3publicationCriticalpatent/ES201412A3/en
Soundproofing, Sound Blocking, And Sound Damping
(AREA)
Abstract
By an improved amplifier of sounds, for industrial vehicles, characterized by consisting of two bodies, one of which is located in the rear of the vehicle, which consists of a microphone of the carbon type, responsible for modulating the direct current of the battery, by means of the vibrations produced by the aforementioned membrane, when activated by sound, which are received, in the other body constituted by a loudspeaker, with cone of plastic material, which improves the sound, which is of a sharper tone, due to the hardness of the cone. (Machine-translation by Google Translate, not legally binding)
ES0201412A1952-01-141952-01-14Perfected sound amplifier for industrial vehicles. (Machine-translation by Google Translate, not legally binding)
ExpiredES201412A3
(en)
Improvements in the acoustic signal warning devices for automobiles, trucks and analog vehicles. (Machine-translation by Google Translate, not legally binding)
A perfection in the transmitter apparatus of acoustic signals for trucks, automobiles and analog vehicles. (Machine-translation by Google Translate, not legally binding)
Improvements in telephones provided with microphone capsule and headset with a piezo-electric crystal (Machine-translation by Google Translate, not legally binding)