FR825569A - Electrical communications systems - Google Patents

Electrical communications systems

Info

Publication number
FR825569A
FR825569A FR825569DA FR825569A FR 825569 A FR825569 A FR 825569A FR 825569D A FR825569D A FR 825569DA FR 825569 A FR825569 A FR 825569A
Authority
FR
France
Prior art keywords
communications systems
electrical communications
electrical
systems
communications
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR825569A publication Critical patent/FR825569A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
FR825569D 1936-08-14 1937-08-13 Electrical communications systems Expired FR825569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB230160X 1936-08-14

Publications (1)

Publication Number Publication Date
FR825569A true FR825569A (en) 1938-03-07

Family

ID=10188719

Family Applications (1)

Application Number Title Priority Date Filing Date
FR825569D Expired FR825569A (en) 1936-08-14 1937-08-13 Electrical communications systems

Country Status (5)

Country Link
BE (1) BE422659A (en)
CH (1) CH230160A (en)
FR (1) FR825569A (en)
GB (1) GB479881A (en)
NL (1) NL49757C (en)

Also Published As

Publication number Publication date
GB479881A (en) 1938-02-14
NL49757C (en)
BE422659A (en)
CH230160A (en) 1943-12-15

Similar Documents

Publication Publication Date Title
FR832598A (en) Electrical communications systems
FR844373A (en) Improvements to frequency-selective electrical systems
FR843159A (en) Transmission systems
FR839857A (en) Powerline carrier systems
FR867451A (en) Radio communications systems
FR833743A (en) Radio transmission systems
FR818884A (en) Electric transmission systems
FR848805A (en) Telecommunications systems
FR841940A (en) Electrical communication systems
FR867359A (en) Radio communications systems
FR829608A (en) Electrical communications cables
FR825569A (en) Electrical communications systems
FR844098A (en) Electrical communications systems
FR822696A (en) Radio communications systems
FR848214A (en) Electrical communication systems
FR847620A (en) Telegraph systems
FR827572A (en) Telegraph communications systems
FR46372E (en) Improvements to electrical network protection systems
FR824206A (en) Electrical control systems
FR836695A (en) Telegraph systems
FR840151A (en) Telegraph communications systems
FR824831A (en) Electrical transformer systems
FR808335A (en) Systems
FR854916A (en) Electrical communications systems
FR823436A (en) Radio guidance systems