BE724752A - - Google Patents
Info
- Publication number
- BE724752A BE724752A BE724752DA BE724752A BE 724752 A BE724752 A BE 724752A BE 724752D A BE724752D A BE 724752DA BE 724752 A BE724752 A BE 724752A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Control Of Direct Current Motors (AREA)
- Measurement Of Current Or Voltage (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54588/67A GB1200909A (en) | 1967-11-30 | 1967-11-30 | Loop current detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE724752A true BE724752A (xx) | 1969-06-02 |
Family
ID=10471497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE724752D BE724752A (xx) | 1967-11-30 | 1968-12-02 |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3579106A (xx) |
| BE (1) | BE724752A (xx) |
| BR (1) | BR6804450D0 (xx) |
| CH (1) | CH483765A (xx) |
| DE (1) | DE1811645A1 (xx) |
| ES (1) | ES360942A1 (xx) |
| FR (1) | FR1599099A (xx) |
| GB (1) | GB1200909A (xx) |
| NL (1) | NL6817093A (xx) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2360375C3 (de) * | 1973-12-04 | 1978-05-24 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Schaltungsanordnung zur Bewertung eines Stromes nach Größe und Richtung |
| JPS5637793A (en) * | 1979-09-05 | 1981-04-11 | Hitachi Ltd | Loop detecting circuit |
| JPS6022571B2 (ja) * | 1979-12-05 | 1985-06-03 | 株式会社日立製作所 | 地絡保護方式 |
| US10648324B2 (en) * | 2013-09-30 | 2020-05-12 | Welladv Oil Service Limited | Auxiliary system for use in drilling |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3047804A (en) * | 1962-07-31 | Apparatus for removing spurious signals | ||
| US2851638A (en) * | 1957-07-03 | 1958-09-09 | Reeves Instrument Corp | Voltage magnitude comparison circuit |
-
1967
- 1967-11-30 GB GB54588/67A patent/GB1200909A/en not_active Expired
-
1968
- 1968-10-22 FR FR1599099D patent/FR1599099A/fr not_active Expired
- 1968-11-14 US US775600A patent/US3579106A/en not_active Expired - Lifetime
- 1968-11-25 CH CH1750668A patent/CH483765A/de not_active IP Right Cessation
- 1968-11-29 NL NL6817093A patent/NL6817093A/xx unknown
- 1968-11-29 DE DE19681811645 patent/DE1811645A1/de active Pending
- 1968-11-29 BR BR204450/68A patent/BR6804450D0/pt unknown
- 1968-11-30 ES ES360942A patent/ES360942A1/es not_active Expired
- 1968-12-02 BE BE724752D patent/BE724752A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH483765A (de) | 1969-12-31 |
| FR1599099A (xx) | 1970-07-15 |
| DE1811645A1 (de) | 1969-07-24 |
| NL6817093A (xx) | 1969-06-03 |
| GB1200909A (en) | 1970-08-05 |
| ES360942A1 (es) | 1970-08-01 |
| BR6804450D0 (pt) | 1973-03-08 |
| US3579106A (en) | 1971-05-18 |