FR779398A - Perfectionnement à la téléphonie - Google Patents
Perfectionnement à la téléphonieInfo
- Publication number
- FR779398A FR779398A FR779398DA FR779398A FR 779398 A FR779398 A FR 779398A FR 779398D A FR779398D A FR 779398DA FR 779398 A FR779398 A FR 779398A
- Authority
- FR
- France
- Prior art keywords
- telephony
- improvement
- telephony improvement
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR779398T | 1933-12-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR779398A true FR779398A (fr) | 1935-04-03 |
Family
ID=9202754
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR779397D Expired FR779397A (fr) | 1933-12-30 | 1933-12-30 | Perfectionnement apporté à la téléphonie |
FR779398D Expired FR779398A (fr) | 1933-12-30 | 1933-12-30 | Perfectionnement à la téléphonie |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR779397D Expired FR779397A (fr) | 1933-12-30 | 1933-12-30 | Perfectionnement apporté à la téléphonie |
Country Status (2)
Country | Link |
---|---|
FR (2) | FR779397A (fr) |
NL (1) | NL42655C (fr) |
-
0
- NL NL42655D patent/NL42655C/xx active
-
1933
- 1933-12-30 FR FR779397D patent/FR779397A/fr not_active Expired
- 1933-12-30 FR FR779398D patent/FR779398A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR779397A (fr) | 1935-04-03 |
NL42655C (fr) |
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