AT121480B - Telephone system for train line. - Google Patents
Telephone system for train line.Info
- Publication number
- AT121480B AT121480B AT121480DA AT121480B AT 121480 B AT121480 B AT 121480B AT 121480D A AT121480D A AT 121480DA AT 121480 B AT121480 B AT 121480B
- Authority
- AT
- Austria
- Prior art keywords
- telephone system
- train line
- train
- line
- telephone
- Prior art date
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)
- Mobile Radio Communication Systems (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Alarm Systems (AREA)
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 |
---|---|---|---|
AT120149D AT120149B (en) | 1928-02-08 | 1928-08-27 | Establishment of telephone systems for train control. |
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. |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT120149D AT120149B (en) | 1928-02-08 | 1928-08-27 | Establishment of telephone systems for train control. |
AT128172D AT128172B (en) | 1928-02-08 | 1928-08-27 | Installation on trainline telephone systems. |
Country Status (3)
Country | Link |
---|---|
AT (3) | AT120149B (en) |
CH (1) | CH143530A (en) |
FR (1) | FR669274A (en) |
-
1928
- 1928-08-27 AT AT120149D patent/AT120149B/en active
- 1928-08-27 AT AT128172D patent/AT128172B/en active
- 1928-08-27 AT AT121480D patent/AT121480B/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 |
---|---|
AT120149B (en) | 1930-12-10 |
FR669274A (en) | 1929-11-14 |
AT128172B (en) | 1932-05-10 |
CH143530A (en) | 1930-11-15 |
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