FR1183332A - Telephone amplifier - Google Patents
Telephone amplifierInfo
- Publication number
- FR1183332A FR1183332A FR1183332DA FR1183332A FR 1183332 A FR1183332 A FR 1183332A FR 1183332D A FR1183332D A FR 1183332DA FR 1183332 A FR1183332 A FR 1183332A
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1183332T | 1957-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1183332A true FR1183332A (en) | 1959-07-06 |
Family
ID=9662938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR1183332D Expired FR1183332A (en) | 1957-09-25 | 1957-09-25 | Telephone amplifier |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR1183332A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3217254A (en) * | 1962-11-26 | 1965-11-09 | Robert M Hughes | Switching system for radio-telephone system |
-
1957
- 1957-09-25 FR FR1183332D patent/FR1183332A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3217254A (en) * | 1962-11-26 | 1965-11-09 | Robert M Hughes | Switching system for radio-telephone system |
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