FR669274A - Telephone system for train operation - Google Patents

Telephone system for train operation

Info

Publication number
FR669274A
FR669274A FR669274DA FR669274A FR 669274 A FR669274 A FR 669274A FR 669274D A FR669274D A FR 669274DA FR 669274 A FR669274 A FR 669274A
Authority
FR
France
Prior art keywords
telephone system
train operation
train
telephone
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Application granted granted Critical
Publication of FR669274A publication Critical patent/FR669274A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/18—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with indirect connection, i.e. through subordinate switching centre
    • H04Q5/22—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with indirect connection, i.e. through subordinate switching centre the subordinate centre not permitting interconnection of subscribers connected thereto

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Alarm Systems (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Mobile Radio Communication Systems (AREA)
FR669274D 1928-02-08 1929-02-07 Telephone system for train operation Expired FR669274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE143530X 1928-02-08

Publications (1)

Publication Number Publication Date
FR669274A true FR669274A (en) 1929-11-14

Family

ID=5669759

Family Applications (1)

Application Number Title Priority Date Filing Date
FR669274D Expired FR669274A (en) 1928-02-08 1929-02-07 Telephone system for train operation

Country Status (3)

Country Link
AT (3) AT120149B (en)
CH (1) CH143530A (en)
FR (1) FR669274A (en)

Also Published As

Publication number Publication date
AT120149B (en) 1930-12-10
AT121480B (en) 1931-02-25
AT128172B (en) 1932-05-10
CH143530A (en) 1930-11-15

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