BE468834A - - Google Patents
Info
- Publication number
- BE468834A BE468834A BE468834DA BE468834A BE 468834 A BE468834 A BE 468834A BE 468834D A BE468834D A BE 468834DA BE 468834 A BE468834 A BE 468834A
- Authority
- BE
- Belgium
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- 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
- H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Interface Circuits In Exchanges (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB12629/40A GB543065A (en) | 1940-08-06 | 1940-08-06 | Improvements in or relating to telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE468834A true BE468834A (en) |
Family
ID=10008213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE468834D BE468834A (en) | 1940-08-06 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2307818A (en) |
| BE (1) | BE468834A (en) |
| FR (1) | FR934998A (en) |
| GB (1) | GB543065A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL66024C (en) * | 1944-06-02 | |||
| US2607854A (en) * | 1947-07-22 | 1952-08-19 | Automatic Elect Lab | Automatic toll telephone system |
| US2596025A (en) * | 1948-01-03 | 1952-05-06 | Ericsson Telefon Ab L M | Signaling over telephone lines by means of a nonlinear resistance |
| US3003040A (en) * | 1956-01-25 | 1961-10-03 | Gen Dynamics Corp | Modified trunk circuit |
-
0
- BE BE468834D patent/BE468834A/xx unknown
-
1940
- 1940-08-06 GB GB12629/40A patent/GB543065A/en not_active Expired
-
1941
- 1941-06-14 US US398006A patent/US2307818A/en not_active Expired - Lifetime
-
1946
- 1946-10-21 FR FR934998D patent/FR934998A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2307818A (en) | 1943-01-12 |
| FR934998A (en) | 1948-06-07 |
| GB543065A (en) | 1942-02-09 |