NL49768C - - Google Patents
Info
- Publication number
- NL49768C NL49768C NL49768DA NL49768C NL 49768 C NL49768 C NL 49768C NL 49768D A NL49768D A NL 49768DA NL 49768 C NL49768 C NL 49768C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE228093X | 1936-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL49768C true NL49768C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=3866209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL49768D NL49768C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1936-11-20 |
Country Status (5)
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965133C (de) * | 1953-10-11 | 1957-06-06 | Telefonbau & Normalzeit Gmbh | Schaltungsanordnung fuer bevorzugte Sprechstellen in Fernsprechanlagen mit Waehlerbetrieb |
| DE1141681B (de) * | 1961-04-07 | 1962-12-27 | Huettenwerk Oberhausen Ag | Fernsprechteilnehmerschaltung fuer Linien-Waehlanlagen mit Freisprecheinrichtung |
-
0
- NL NL49768D patent/NL49768C/xx active
- BE BE418493D patent/BE418493A/xx unknown
-
1937
- 1937-11-12 GB GB31154/37A patent/GB493668A/en not_active Expired
- 1937-11-17 CH CH228093D patent/CH228093A/de unknown
- 1937-11-19 FR FR829576D patent/FR829576A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH228093A (de) | 1943-07-31 |
| BE418493A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | |
| FR829576A (fr) | 1938-06-30 |
| GB493668A (en) | 1938-10-12 |