AT121480B - Telephone system for train line. - Google Patents

Telephone system for train line.

Info

Publication number: AT121480B
Authority: AT; Austria
Prior art keywords: telephone system; train line; train; line; telephone
Prior art date: 1928-02-08

Application number

Other languages

German (de)

Inventor

Richard Urban

Original Assignee

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.)

1928-02-08

Filing date

1928-08-27

Publication date

1931-02-25

1928-08-27 Application filed by Siemens Ag filed Critical Siemens Ag

1931-02-25 Application granted granted Critical

1931-02-25 Publication of AT121480B publication Critical patent/AT121480B/en

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)

AT121480D 1928-02-08 1928-08-27 Telephone system for train line. AT121480B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number	Publication Date
AT121480B true AT121480B (en)	1931-02-25

Family

ID=5669759

Family Applications (3)

Application Number	Title	Priority Date	Filing Date
AT128172D AT128172B (en)	1928-02-08	1928-08-27	Installation on trainline telephone systems.
AT121480D AT121480B (en)	1928-02-08	1928-08-27	Telephone system for train line.
AT120149D AT120149B (en)	1928-02-08	1928-08-27	Establishment of telephone systems for train control.

Family Applications Before (1)

Application Number	Title	Priority Date	Filing Date
AT128172D AT128172B (en)	1928-02-08	1928-08-27	Installation on trainline telephone systems.

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
AT120149D AT120149B (en)	1928-02-08	1928-08-27	Establishment of telephone systems for train control.

Country Status (3)

Country	Link
AT (3)	AT128172B (en)
CH (1)	CH143530A (en)
FR (1)	FR669274A (en)

1928
- 1928-08-27 AT AT128172D patent/AT128172B/en active
- 1928-08-27 AT AT121480D patent/AT121480B/en active
- 1928-08-27 AT AT120149D patent/AT120149B/en active
1929
- 1929-02-04 CH CH143530D patent/CH143530A/en unknown
- 1929-02-07 FR FR669274D patent/FR669274A/en not_active Expired

Also Published As

Publication number	Publication date
FR669274A (en)	1929-11-14
CH143530A (en)	1930-11-15
AT120149B (en)	1930-12-10
AT128172B (en)	1932-05-10

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