FR57897E - Installation téléphonique - Google Patents
Installation téléphoniqueInfo
- Publication number
- FR57897E FR57897E FR57897DA FR57897E FR 57897 E FR57897 E FR 57897E FR 57897D A FR57897D A FR 57897DA FR 57897 E FR57897 E FR 57897E
- Authority
- FR
- France
- Prior art keywords
- telephone installation
- telephone
- installation
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
- H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR57897T | 1947-12-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR57897E true FR57897E (fr) | 1953-09-18 |
Family
ID=8691865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR57897D Expired FR57897E (fr) | 1947-12-26 | 1947-12-26 | Installation téléphonique |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR57897E (fr) |
-
1947
- 1947-12-26 FR FR57897D patent/FR57897E/fr not_active Expired
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