NL7204336A - - Google Patents
Info
- Publication number
- NL7204336A NL7204336A NL7204336A NL7204336A NL7204336A NL 7204336 A NL7204336 A NL 7204336A NL 7204336 A NL7204336 A NL 7204336A NL 7204336 A NL7204336 A NL 7204336A NL 7204336 A NL7204336 A NL 7204336A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Push-Button Switches (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2116181 | 1971-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL7204336A true NL7204336A (2) | 1972-10-04 |
Family
ID=5803715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL7204336A NL7204336A (2) | 1971-04-02 | 1972-03-30 |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE781389A (2) |
| CH (1) | CH551726A (2) |
| DE (1) | DE2116181B1 (2) |
| FR (1) | FR2136101A5 (2) |
| NL (1) | NL7204336A (2) |
-
1971
- 1971-04-02 DE DE2116181A patent/DE2116181B1/de active Pending
-
1972
- 1972-03-29 BE BE781389A patent/BE781389A/xx unknown
- 1972-03-30 FR FR7211328A patent/FR2136101A5/fr not_active Expired
- 1972-03-30 CH CH477772A patent/CH551726A/xx not_active IP Right Cessation
- 1972-03-30 NL NL7204336A patent/NL7204336A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2136101A5 (2) | 1972-12-22 |
| DE2116181B1 (de) | 1972-10-05 |
| BE781389A (fr) | 1972-07-17 |
| CH551726A (de) | 1974-07-15 |