NL32155C - - Google Patents
Info
- Publication number
- NL32155C NL32155C NL32155DA NL32155C NL 32155 C NL32155 C NL 32155C NL 32155D A NL32155D A NL 32155DA NL 32155 C NL32155 C NL 32155C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M5/00—Manual exchanges
- H04M5/04—Arrangements for indicating calls or supervising connections for calling or clearing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Interface Circuits In Exchanges (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE538837T | 1929-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL32155C true NL32155C (en:Method) |
Family
ID=34122368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL32155D NL32155C (en:Method) | 1929-08-22 |
Country Status (4)
| Country | Link |
|---|---|
| DE (2) | DE538837C (en:Method) |
| FR (1) | FR703983A (en:Method) |
| GB (1) | GB362478A (en:Method) |
| NL (1) | NL32155C (en:Method) |
-
0
- NL NL32155D patent/NL32155C/xx active
-
1930
- 1930-08-07 GB GB23724/30A patent/GB362478A/en not_active Expired
- 1930-08-12 FR FR703983D patent/FR703983A/fr not_active Expired
- 1930-08-22 DE DE1930538837D patent/DE538837C/de not_active Expired
- 1930-09-20 DE DE1930604196D patent/DE604196C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR703983A (fr) | 1931-05-08 |
| DE604196C (de) | 1934-10-19 |
| DE538837C (de) | 1931-11-19 |
| GB362478A (en) | 1931-12-07 |