ES335149A1 - Perfeccionamientos en interfonos. - Google Patents

Perfeccionamientos en interfonos.

Info

Publication number
ES335149A1
ES335149A1 ES0335149A ES335149A ES335149A1 ES 335149 A1 ES335149 A1 ES 335149A1 ES 0335149 A ES0335149 A ES 0335149A ES 335149 A ES335149 A ES 335149A ES 335149 A1 ES335149 A1 ES 335149A1
Authority
ES
Spain
Prior art keywords
rectifier
microphone
translator
terminals
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES0335149A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to ES0335149A priority Critical patent/ES335149A1/es
Publication of ES335149A1 publication Critical patent/ES335149A1/es
Expired legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
ES0335149A 1966-12-31 1966-12-31 Perfeccionamientos en interfonos. Expired ES335149A1 (es)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES0335149A ES335149A1 (es) 1966-12-31 1966-12-31 Perfeccionamientos en interfonos.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES0335149A ES335149A1 (es) 1966-12-31 1966-12-31 Perfeccionamientos en interfonos.

Publications (1)

Publication Number Publication Date
ES335149A1 true ES335149A1 (es) 1967-11-16

Family

ID=59520585

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0335149A Expired ES335149A1 (es) 1966-12-31 1966-12-31 Perfeccionamientos en interfonos.

Country Status (1)

Country Link
ES (1) ES335149A1 (es)

Similar Documents

Publication Publication Date Title
GB938476A (en) Improvements in or relating to logical systems
US3205307A (en) Circuit for intercommunication systems
US2632056A (en) Busy signal for intercommunicating telephone systems
ES320241A1 (es) Un dispositivo transmisor para uso en un sistema de seleccion de frecuencia vocal por pulsadores.
AU437662B2 (en) Circuit arrangement fora pulse-controlled connection ofa telecommunication signal source toa telecommunication signal load
US3202760A (en) Intercommunication system
AU406949B2 (en) Telephone line circuit
JPS556928A (en) Extension answer connecting system for key telephone system
GB1356927A (en) Telephone intercommunication systems
ES122992U (es) Circuito electrico de intercomunicacion acustico luminoso.
AU427919B2 (en) Circuit arrangement for switching on the engaged signal and the engaged tone in communication, particularly telephone exchange installations
GB1094451A (en) Improvements relating to electric discriminating circuits
CA733678A (en) Interrupter circuit for telephone systems
AU2848767A (en) Circuit arrangement for switching on the engaged signal and the engaged tone in communication, particularly telephone exchange installations
AU419092B2 (en) Circuit arrangement for simultaneous signalling in both transmission directions between two terminal stations in telecommunication systems
GB1164592A (en) A Circuit Arrangement for use in Automatic Loud-Speaking Intercoms.
ES221503A1 (es) Nuevo sistema eléctrico para propaganda
ES300902A1 (es) Un aparato intercomunicador transistorizado
GB889754A (en) Electronic gate circuit
GB581562A (en) Improvements in or relating to loud speaking telephone systems
CA641673A (en) Telephone switching circuit
GB1045203A (en) Electric changeover circuit arrangement
CA742311A (en) Telephone signal reporting system
CA601815A (en) Telephone ringing signal switching circuits
GB957456A (en) Circuit arrangement for a key-controlled intercommunication system of the type in which each substation set is provided with a facility for calling any other station