Dynamic electroacoustic transducer for radio telephone handpiece - has housing receiving insert containing magnetic system and providing support face for membrane edge
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Electrodynamic transducer
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Piezoelectric telephone capsule
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Device for strain relief of a lead
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Electro-acoustic transducer, in particular for telephony purposes
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Earpiece and/or microphone capsule
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Signalling and loudspeaker system for mining installation - uses HF transmitter and earphones worn by miners to counteract working noise
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Magnetic drive assembly for pressure driven loudspeaker - has cylindrical magnet and membrane held by two plastics rings
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Remote control system for machinery in areas exposed to thunderstorms - uses LEDs at transmitter and receiver to indicate shorts and breaks in control line
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Intrinsically safe control of electric switchgear - is through a control line supplied with AC near the switch with a terminal rectifier
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Receiver for telephone instrument - has a plug-in connection with connecting wires in a receiver case recess
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Capsule-shaped electroacoustical transducer - is used as earpiece for telephone instruments, and has sockets for cable connection
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ELECTROACOUSTIC CONVERTER, IN PARTICULAR FOR TELEPHONE AND TELEPHONE CAPSULES OF TELEPHONE SETS
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ELECTROACOUSTIC CONVERTER, IN PARTICULAR FOR TELEPHONE AND TELEPHONE CAPSULES OF TELEPHONE SETS
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ELECTRODYNAMIC CONVERTER, IN PARTICULAR HOER CAPSULE FOR TELEPHONE PURPOSES
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Damped telephone earpiece membrane - all oscillation compensated by using an elastic clamping ring fitted with recesses
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Electrodynamic converter, in particular ear capsule for telephone purposes with a housing made of plastic
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Circuit arrangement for receivers in ripple control systems
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Ripple control receiver for network remote control according to the pulse selection process
