FR539603A - Two-cylinder telephonograph - Google Patents
Two-cylinder telephonographInfo
- Publication number
- FR539603A FR539603A FR539603DA FR539603A FR 539603 A FR539603 A FR 539603A FR 539603D A FR539603D A FR 539603DA FR 539603 A FR539603 A FR 539603A
- Authority
- FR
- France
- Prior art keywords
- telephonograph
- cylinder
- cylinder telephonograph
- 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
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Drawing Aids And Blackboards (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE342901T | 1920-08-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR539603A true FR539603A (en) | 1922-06-28 |
Family
ID=33459956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR539603D Expired FR539603A (en) | 1920-08-25 | 1921-08-23 | Two-cylinder telephonograph |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE342901C (en) |
FR (1) | FR539603A (en) |
GB (1) | GB168305A (en) |
-
1920
- 1920-08-25 DE DE1920342901D patent/DE342901C/en not_active Expired
-
1921
- 1921-07-19 GB GB1947921A patent/GB168305A/en not_active Expired
- 1921-08-23 FR FR539603D patent/FR539603A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB168305A (en) | 1922-03-02 |
DE342901C (en) | 1921-10-25 |
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