FR765736A - Device facilitating the observation of the duration of telephone calls - Google Patents
Device facilitating the observation of the duration of telephone callsInfo
- Publication number
- FR765736A FR765736A FR765736DA FR765736A FR 765736 A FR765736 A FR 765736A FR 765736D A FR765736D A FR 765736DA FR 765736 A FR765736 A FR 765736A
- Authority
- FR
- France
- Prior art keywords
- observation
- duration
- telephone calls
- device facilitating
- facilitating
- 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
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR765736T | 1933-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR765736A true FR765736A (en) | 1934-06-14 |
Family
ID=9182924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR765736D Expired FR765736A (en) | 1933-12-18 | 1933-12-18 | Device facilitating the observation of the duration of telephone calls |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR765736A (en) |
-
1933
- 1933-12-18 FR FR765736D patent/FR765736A/en not_active Expired
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