FR852417A - Amplificateur téléphonique - Google Patents
Amplificateur téléphoniqueInfo
- Publication number
- FR852417A FR852417A FR852417DA FR852417A FR 852417 A FR852417 A FR 852417A FR 852417D A FR852417D A FR 852417DA FR 852417 A FR852417 A FR 852417A
- Authority
- FR
- France
- Prior art keywords
- telephone amplifier
- telephone
- amplifier
- 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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR852417T | 1939-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR852417A true FR852417A (fr) | 1940-02-01 |
Family
ID=9326629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR852417D Expired FR852417A (fr) | 1939-03-31 | 1939-03-31 | Amplificateur téléphonique |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR852417A (fr) |
-
1939
- 1939-03-31 FR FR852417D patent/FR852417A/fr not_active Expired
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