FR518414A - écouteur téléphonique - Google Patents
écouteur téléphoniqueInfo
- Publication number
- FR518414A FR518414A FR518414A FR518414DA FR518414A FR 518414 A FR518414 A FR 518414A FR 518414 A FR518414 A FR 518414A FR 518414D A FR518414D A FR 518414DA FR 518414 A FR518414 A FR 518414A
- Authority
- FR
- France
- Prior art keywords
- phone earpiece
- earpiece
- phone
- 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
- H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE337473T |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR518414A true FR518414A (fr) | 1921-05-26 |
Family
ID=6221505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR518414A Expired FR518414A (fr) | 1919-05-17 | écouteur téléphonique |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE337473C (fr) |
| FR (1) | FR518414A (fr) |
| NL (1) | NL5824C (fr) |
-
0
- DE DENDAT337473D patent/DE337473C/de not_active Expired
- NL NL5824D patent/NL5824C/xx active
-
1919
- 1919-05-17 FR FR518414A patent/FR518414A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL5824C (fr) | |
| DE337473C (de) | 1921-06-03 |
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