FR660753A - Perfectionnements aux micro-téléphones - Google Patents
Perfectionnements aux micro-téléphonesInfo
- Publication number
- FR660753A FR660753A FR660753DA FR660753A FR 660753 A FR660753 A FR 660753A FR 660753D A FR660753D A FR 660753DA FR 660753 A FR660753 A FR 660753A
- 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 |
---|---|---|---|
SE297390X | 1927-09-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR660753A true FR660753A (fr) | 1929-07-17 |
Family
ID=20307356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR660753D Expired FR660753A (fr) | 1927-09-20 | 1928-09-14 | Perfectionnements aux micro-téléphones |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE354302A (fr) |
FR (1) | FR660753A (fr) |
GB (1) | GB297390A (fr) |
NL (1) | NL25060C (fr) |
-
0
- BE BE354302D patent/BE354302A/xx unknown
- NL NL25060D patent/NL25060C/xx active
-
1928
- 1928-09-14 FR FR660753D patent/FR660753A/fr not_active Expired
- 1928-09-18 GB GB26757/28A patent/GB297390A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL25060C (fr) | |
BE354302A (fr) | |
GB297390A (en) | 1929-11-28 |
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