BE797143A - AUDIO-VISUAL DEVICE WITH A REDUCED NUMBER OF CONDUCTORS, ESPECIALLY BETWEEN THE ENTRY OF A SINGLE-FAMILY HOME AND A FEW STATIONS INSIDE THIS - Google Patents

AUDIO-VISUAL DEVICE WITH A REDUCED NUMBER OF CONDUCTORS, ESPECIALLY BETWEEN THE ENTRY OF A SINGLE-FAMILY HOME AND A FEW STATIONS INSIDE THIS

Info

Publication number
BE797143A
BE797143A BE6044069A BE6044069A BE797143A BE 797143 A BE797143 A BE 797143A BE 6044069 A BE6044069 A BE 6044069A BE 6044069 A BE6044069 A BE 6044069A BE 797143 A BE797143 A BE 797143A
Authority
BE
Belgium
Prior art keywords
conductors
audio
entry
reduced number
visual device
Prior art date
Application number
BE6044069A
Other languages
French (fr)
Original Assignee
Barbuti Ottorino
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 Barbuti Ottorino filed Critical Barbuti Ottorino
Publication of BE797143A publication Critical patent/BE797143A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
    • H04N7/186—Video door telephones
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
BE6044069A 1972-03-23 1973-03-21 AUDIO-VISUAL DEVICE WITH A REDUCED NUMBER OF CONDUCTORS, ESPECIALLY BETWEEN THE ENTRY OF A SINGLE-FAMILY HOME AND A FEW STATIONS INSIDE THIS BE797143A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2141472 1972-03-23

Publications (1)

Publication Number Publication Date
BE797143A true BE797143A (en) 1973-07-16

Family

ID=11181404

Family Applications (1)

Application Number Title Priority Date Filing Date
BE6044069A BE797143A (en) 1972-03-23 1973-03-21 AUDIO-VISUAL DEVICE WITH A REDUCED NUMBER OF CONDUCTORS, ESPECIALLY BETWEEN THE ENTRY OF A SINGLE-FAMILY HOME AND A FEW STATIONS INSIDE THIS

Country Status (3)

Country Link
BE (1) BE797143A (en)
DE (1) DE2306109A1 (en)
FR (1) FR2177411A7 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1165528B (en) * 1980-12-15 1987-04-22 Urmet Spa DOOR PHONE SYSTEM WITH IMAGE TRANSMISSION USING FOUR COMMON CONDUCTORS AND A SELECTION CONDUCTOR FOR EACH INTERNAL STATION

Also Published As

Publication number Publication date
FR2177411A7 (en) 1973-11-02
DE2306109A1 (en) 1973-10-04

Similar Documents

Publication Publication Date Title
NL178095C (en) SWIVEL COUPLING FOR PIPES AND THE LIKE.
NL162808C (en) CABLE TELEVISION SYSTEM.
CA942519A (en) Shaft coupling locking device
AU5085273A (en) Poultry cage. floor and poultry cage
CA929761A (en) Flexible couplings
CA930397A (en) Aerator and spray device
CS179402B2 (en) Insecticide and acaricide agents
BE797143A (en) AUDIO-VISUAL DEVICE WITH A REDUCED NUMBER OF CONDUCTORS, ESPECIALLY BETWEEN THE ENTRY OF A SINGLE-FAMILY HOME AND A FEW STATIONS INSIDE THIS
CA1005290A (en) Hydrophobizing and swelling-preventive agent
CH551061A (en) DISPLAY DEVICE.
CA977839A (en) Combination vital level detector and "and" gate
CA958156A (en) Fixing agent solutions
FR1529484A (en) Rotary spherical sealing device for conduits, pipes and the like
CA951259A (en) Hose construction and utilization
BE770805A (en) THE ANTIBIOTIC CP-21.635
AU464115B2 (en) Telephone intercommunicating system
Schetky THE EXPLOSIVE FABRICATION OF DUPLEX TUBE
CA880083A (en) Laying cage and system
Patel Protection of overhead transmission lines
IT992879B (en) TELEVISION TRANSMISSION SYSTEM
CA851942A (en) Inclined planter and retaining wall construction
CA642077A (en) Trench wall retainer
CA858937A (en) Combined conveying and distributing device
CA841573A (en) Dithiocarbanilates and anthelmintic agents
CA984000A (en) Dispositif supraconducteur de stockage et liberation d'energie avec tres grande rapidite de reponse