BE467440A - - Google Patents
Info
- Publication number
- BE467440A BE467440A BE467440DA BE467440A BE 467440 A BE467440 A BE 467440A BE 467440D A BE467440D A BE 467440DA BE 467440 A BE467440 A BE 467440A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/025—Door telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US434339A US2345046A (en) | 1942-03-12 | 1942-03-12 | Intercommunicating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE467440A true BE467440A (en, 2012) |
Family
ID=23723823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE467440D BE467440A (en, 2012) | 1942-03-12 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2345046A (en, 2012) |
| BE (1) | BE467440A (en, 2012) |
| FR (1) | FR938320A (en, 2012) |
| NL (1) | NL66226C (en, 2012) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB597170A (en) * | 1945-03-29 | 1948-01-20 | Philips Nv | Improvements in loud-speaking telephone arrangements |
-
0
- BE BE467440D patent/BE467440A/xx unknown
- NL NL66226D patent/NL66226C/xx active
-
1942
- 1942-03-12 US US434339A patent/US2345046A/en not_active Expired - Lifetime
-
1946
- 1946-08-19 FR FR938320D patent/FR938320A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL66226C (en, 2012) | |
| FR938320A (fr) | 1948-09-10 |
| US2345046A (en) | 1944-03-28 |