FR877937A - Installation téléphonique intérieure - Google Patents
Installation téléphonique intérieureInfo
- Publication number
- FR877937A FR877937A FR877937DA FR877937A FR 877937 A FR877937 A FR 877937A FR 877937D A FR877937D A FR 877937DA FR 877937 A FR877937 A FR 877937A
- Authority
- FR
- France
- Prior art keywords
- telephone system
- indoor telephone
- indoor
- 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
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE877937X | 1940-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR877937A true FR877937A (fr) | 1943-01-06 |
Family
ID=6818297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR877937D Expired FR877937A (fr) | 1940-12-23 | 1941-12-20 | Installation téléphonique intérieure |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR877937A (fr) |
-
1941
- 1941-12-20 FR FR877937D patent/FR877937A/fr not_active Expired
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