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FR684009A - Improvements to signaling systems - Google Patents

Improvements to signaling systems

Info

Publication number
FR684009A
FR684009A FR684009DA FR684009A FR 684009 A FR684009 A FR 684009A FR 684009D A FR684009D A FR 684009DA FR 684009 A FR684009 A FR 684009A
Authority
FR
France
Prior art keywords
signaling systems
signaling
systems
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR684009A publication Critical patent/FR684009A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
FR684009D 1928-10-30 1929-10-28 Improvements to signaling systems Expired FR684009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE684009X 1928-10-30

Publications (1)

Publication Number Publication Date
FR684009A true FR684009A (en) 1930-06-20

Family

ID=20314999

Family Applications (1)

Application Number Title Priority Date Filing Date
FR684009D Expired FR684009A (en) 1928-10-30 1929-10-28 Improvements to signaling systems

Country Status (1)

Country Link
FR (1) FR684009A (en)

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