NL21064C - - Google Patents
Info
- Publication number
- NL21064C NL21064C NL21064DA NL21064C NL 21064 C NL21064 C NL 21064C NL 21064D A NL21064D A NL 21064DA NL 21064 C NL21064 C NL 21064C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64293A US1689598A (en) | 1925-10-23 | 1925-10-23 | Telephone substation circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL21064C true NL21064C (en:Method) |
Family
ID=22054919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL21064D NL21064C (en:Method) | 1925-10-23 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1689598A (en:Method) |
| BE (1) | BE336202A (en:Method) |
| DE (1) | DE583007C (en:Method) |
| GB (1) | GB260214A (en:Method) |
| NL (1) | NL21064C (en:Method) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2643300A (en) * | 1947-11-04 | 1953-06-23 | Siemens Ag Albis | Telephone subscriber set with sidetone reduction for central battery systems |
-
0
- NL NL21064D patent/NL21064C/xx active
- BE BE336202D patent/BE336202A/xx unknown
-
1925
- 1925-10-23 US US64293A patent/US1689598A/en not_active Expired - Lifetime
-
1926
- 1926-07-12 GB GB17435/26A patent/GB260214A/en not_active Expired
- 1926-10-24 DE DEA49041D patent/DE583007C/de not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2643300A (en) * | 1947-11-04 | 1953-06-23 | Siemens Ag Albis | Telephone subscriber set with sidetone reduction for central battery systems |
Also Published As
| Publication number | Publication date |
|---|---|
| US1689598A (en) | 1928-10-30 |
| DE583007C (de) | 1933-08-26 |
| BE336202A (en:Method) | |
| GB260214A (en) | 1927-10-12 |