FR728168A - Telephone amplifier - Google Patents
Telephone amplifierInfo
- Publication number
- FR728168A FR728168A FR728168DA FR728168A FR 728168 A FR728168 A FR 728168A FR 728168D A FR728168D A FR 728168DA FR 728168 A FR728168 A FR 728168A
- 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
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR728168T | 1931-12-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR728168A true FR728168A (en) | 1932-06-30 |
Family
ID=9111689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR728168D Expired FR728168A (en) | 1931-12-12 | 1931-12-12 | Telephone amplifier |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR728168A (en) |
-
1931
- 1931-12-12 FR FR728168D patent/FR728168A/en not_active Expired
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