FR689473A - Perfectionnements aux micro-téléphones - Google Patents
Perfectionnements aux micro-téléphonesInfo
- Publication number
- FR689473A FR689473A FR689473DA FR689473A FR 689473 A FR689473 A FR 689473A FR 689473D A FR689473D A FR 689473DA FR 689473 A FR689473 A FR 689473A
- Authority
- FR
- France
- Prior art keywords
- telephones
- micro
- 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
- H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE333861X | 1929-02-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR689473A true FR689473A (fr) | 1930-09-08 |
Family
ID=20308178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR689473D Expired FR689473A (fr) | 1929-02-09 | 1930-02-05 | Perfectionnements aux micro-téléphones |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE367612A (fr) |
FR (1) | FR689473A (fr) |
GB (1) | GB333861A (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2475303A (en) * | 1946-08-26 | 1949-07-05 | Colorphone Inc | Decorative cover for telephone handpieces |
US4087659A (en) * | 1977-01-21 | 1978-05-02 | Boenecke Charles A | Tamperproof handset for railroad applications |
-
0
- BE BE367612D patent/BE367612A/xx unknown
-
1930
- 1930-02-05 FR FR689473D patent/FR689473A/fr not_active Expired
- 1930-02-07 GB GB4210/30A patent/GB333861A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB333861A (en) | 1930-08-21 |
BE367612A (fr) |
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