FR938541A - Telephone device - Google Patents
Telephone deviceInfo
- Publication number
- FR938541A FR938541A FR938541DA FR938541A FR 938541 A FR938541 A FR 938541A FR 938541D A FR938541D A FR 938541DA FR 938541 A FR938541 A FR 938541A
- Authority
- FR
- France
- Prior art keywords
- telephone device
- telephone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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 |
---|---|
FR938541A true FR938541A (en) | 1948-10-18 |
Family
ID=24103974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR938541D Expired FR938541A (en) | 1944-03-25 | 1946-12-20 | Telephone device |
Country Status (3)
Country | Link |
---|---|
US (1) | US2385515A (en) |
FR (1) | FR938541A (en) |
NL (1) | NL68231C (en) |
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 (en) * | 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/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2385515A (en) | 1945-09-25 |
NL68231C (en) |
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