NL68231C - - Google Patents
Info
- Publication number
- NL68231C NL68231C NL68231DA NL68231C NL 68231 C NL68231 C NL 68231C NL 68231D A NL68231D A NL 68231DA NL 68231 C NL68231 C NL 68231C
- Authority
- NL
- Netherlands
Links
Classifications
-
- 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
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 |
|---|---|---|---|
| US528030A US2385515A (en) | 1944-03-25 | 1944-03-25 | Intercommunication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL68231C true NL68231C (US07321065-20080122-C00020.png) |
Family
ID=24103974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL68231D NL68231C (US07321065-20080122-C00020.png) | 1944-03-25 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2385515A (US07321065-20080122-C00020.png) |
| FR (1) | FR938541A (US07321065-20080122-C00020.png) |
| NL (1) | NL68231C (US07321065-20080122-C00020.png) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2632056A (en) * | 1947-12-30 | 1953-03-17 | Rauland Corp | Busy signal for intercommunicating telephone systems |
| US2547854A (en) * | 1948-02-06 | 1951-04-03 | Webster Electric Co Inc | Intercommunication apparatus |
| US2744966A (en) * | 1950-10-05 | 1956-05-08 | Executone Inf Sys Inc | Intercommunication system |
| US2802055A (en) * | 1952-08-29 | 1957-08-06 | Siemens Ag | Two-way loudspeaker intercommunication system |
| US2741667A (en) * | 1953-02-11 | 1956-04-10 | Commercial Radio Sound Corp | Privacy guarded telephone intercommunicating system |
| BE539028A (US07321065-20080122-C00020.png) * | 1954-08-23 |
-
0
- NL NL68231D patent/NL68231C/xx active
-
1944
- 1944-03-25 US US528030A patent/US2385515A/en not_active Expired - Lifetime
-
1946
- 1946-12-20 FR FR938541D patent/FR938541A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2385515A (en) | 1945-09-25 |
| FR938541A (fr) | 1948-10-18 |
