FR720076A - Système radiotéléphonique d'intercommunication sur fils - Google Patents

Système radiotéléphonique d'intercommunication sur fils

Info

Publication number
FR720076A
FR720076A FR720076DA FR720076A FR 720076 A FR720076 A FR 720076A FR 720076D A FR720076D A FR 720076DA FR 720076 A FR720076 A FR 720076A
Authority
FR
France
Prior art keywords
radiotelephone system
wired intercom
intercom
wired
radiotelephone
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
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.)
INTERNAT RADIOPHONE CORP
Original Assignee
INTERNAT RADIOPHONE CORP
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 INTERNAT RADIOPHONE CORP filed Critical INTERNAT RADIOPHONE CORP
Application granted granted Critical
Publication of FR720076A publication Critical patent/FR720076A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/56—Circuits using the same frequency for two directions of communication with provision for simultaneous communication in two directions

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
FR720076D 1930-07-19 1931-07-16 Système radiotéléphonique d'intercommunication sur fils Expired FR720076A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US380199XA 1930-07-19 1930-07-19

Publications (1)

Publication Number Publication Date
FR720076A true FR720076A (fr) 1932-02-15

Family

ID=21897645

Family Applications (1)

Application Number Title Priority Date Filing Date
FR720076D Expired FR720076A (fr) 1930-07-19 1931-07-16 Système radiotéléphonique d'intercommunication sur fils

Country Status (2)

Country Link
FR (1) FR720076A (fr)
GB (1) GB380199A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777652A (en) * 1982-07-27 1988-10-11 A.R.F. Products Radio communication systems for underground mines

Also Published As

Publication number Publication date
GB380199A (en) 1932-09-15

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