IT500212A - - Google Patents
Info
- Publication number
- IT500212A IT500212A IT500212DA IT500212A IT 500212 A IT500212 A IT 500212A IT 500212D A IT500212D A IT 500212DA IT 500212 A IT500212 A IT 500212A
- Authority
- IT
- Italy
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
- H04Q1/22—Automatic arrangements
- H04Q1/26—Automatic arrangements for signalling trouble in unoccupied sub-exchanges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
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- 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
- H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL9476A DE874471C (de) | 1951-07-04 | 1951-07-04 | Schaltungsanordnung fuer Fernsprechanlagen mit Haupt- und Unteraemtern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT500212A true IT500212A (id) |
Family
ID=7257997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT500212D IT500212A (id) | 1951-07-04 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE874471C (id) |
| IT (1) | IT500212A (id) |
| NL (1) | NL95509C (id) |
-
0
- NL NL95509D patent/NL95509C/xx active
- IT IT500212D patent/IT500212A/it unknown
-
1951
- 1951-07-04 DE DEL9476A patent/DE874471C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL95509C (id) | |
| DE874471C (de) | 1953-04-23 |