NL234653A - - Google Patents
Info
- Publication number
- NL234653A NL234653A NL234653DA NL234653A NL 234653 A NL234653 A NL 234653A NL 234653D A NL234653D A NL 234653DA NL 234653 A NL234653 A NL 234653A
- Authority
- NL
- Netherlands
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Exchange Systems With Centralized Control (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Paper Feeding For Electrophotography (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US706342A US2894072A (en) | 1957-12-31 | 1957-12-31 | Centralized memory line concentrator system |
Publications (1)
Publication Number | Publication Date |
---|---|
NL234653A true NL234653A (zh) |
Family
ID=24837144
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL130183D NL130183C (zh) | 1957-12-31 | ||
NL234653D NL234653A (zh) | 1957-12-31 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL130183D NL130183C (zh) | 1957-12-31 |
Country Status (6)
Country | Link |
---|---|
US (1) | US2894072A (zh) |
BE (1) | BE574292A (zh) |
DE (1) | DE1149407B (zh) |
FR (1) | FR1221633A (zh) |
GB (1) | GB908700A (zh) |
NL (2) | NL234653A (zh) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE550511A (zh) * | 1955-08-23 | |||
FR1187979A (fr) * | 1958-01-14 | 1959-09-17 | Constr Telephoniques | Perfectionnements aux systèmes téléphoniques |
US3047665A (en) * | 1958-03-28 | 1962-07-31 | Bell Telephone Labor Inc | Traffic recorder |
FR1212109A (fr) * | 1958-07-26 | 1960-03-22 | Concentrateur de trafic téléphonique | |
US3106615A (en) * | 1958-12-22 | 1963-10-08 | Automatic Elect Lab | Communication switching system |
US3114007A (en) * | 1959-07-01 | 1963-12-10 | Bell Telephone Labor Inc | Supervisory circuit |
US3151219A (en) * | 1959-07-28 | 1964-09-29 | Gen Dynamics Corp | Tone detecting circuitry |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2774822A (en) * | 1952-08-02 | 1956-12-18 | Bell Telephone Labor Inc | Communication system |
US2715656A (en) * | 1952-08-02 | 1955-08-16 | Bell Telephone Labor Inc | Electrical information system |
DE971475C (de) * | 1953-08-21 | 1959-02-05 | Int Standard Electric Corp | Schaltungsanordnung fuer grosse automatische Landzentralen |
US2812385A (en) * | 1955-12-28 | 1957-11-05 | Bell Telephone Labor Inc | Line concentrator system |
-
0
- NL NL130183D patent/NL130183C/xx active
- NL NL234653D patent/NL234653A/xx unknown
-
1957
- 1957-12-31 US US706342A patent/US2894072A/en not_active Expired - Lifetime
-
1958
- 1958-12-19 FR FR782202A patent/FR1221633A/fr not_active Expired
- 1958-12-19 GB GB41006/58A patent/GB908700A/en not_active Expired
- 1958-12-29 BE BE574292A patent/BE574292A/fr unknown
- 1958-12-30 DE DEW24773A patent/DE1149407B/de active Pending
Also Published As
Publication number | Publication date |
---|---|
FR1221633A (fr) | 1960-06-02 |
NL130183C (zh) | |
DE1149407B (de) | 1963-05-30 |
BE574292A (fr) | 1959-04-16 |
GB908700A (en) | 1962-10-24 |
US2894072A (en) | 1959-07-07 |