BE653947A - - Google Patents
Info
- Publication number
- BE653947A BE653947A BE653947DA BE653947A BE 653947 A BE653947 A BE 653947A BE 653947D A BE653947D A BE 653947DA BE 653947 A BE653947 A BE 653947A
- Authority
- BE
- Belgium
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)
- Electronic Switches (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31513663A | 1963-10-10 | 1963-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE653947A true BE653947A (xx) | 1965-04-05 |
Family
ID=23223057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE653947D BE653947A (xx) | 1963-10-10 | 1964-10-05 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3284577A (xx) |
| BE (1) | BE653947A (xx) |
| DE (1) | DE1244870C2 (xx) |
| GB (1) | GB1009247A (xx) |
| SE (1) | SE313847B (xx) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1487960C3 (de) * | 1966-01-28 | 1973-11-22 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Tastengesteuerter Zweifrequenz Tongenerator fur die Wahlkennzeichen gäbe in Fernmelde , insbesondere Fern sprechvermittlungsanlagen |
| US3515807A (en) * | 1966-05-05 | 1970-06-02 | Automatic Elect Lab | Conference arrangement having a plurality of transmission modes |
| CA947444A (en) * | 1972-04-17 | 1974-05-14 | Bell Canada | Telephone substation apparatus |
| US3971896A (en) * | 1973-11-16 | 1976-07-27 | Iwasaki Tsushinki Kabushiki Kaisha | Two-tone generator using switching transistors in LC resonant circuits controlled by push-button |
| US3970801A (en) * | 1974-12-03 | 1976-07-20 | Motorola, Inc. | Dialing apparatus for a portable radio telephone |
| US4315108A (en) * | 1975-09-29 | 1982-02-09 | Mostek Corporation | Integrated circuit chip telephone communication system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL242923A (xx) * | 1958-09-08 | |||
| USRE25507E (en) * | 1959-12-16 | 1964-01-07 | Frequency - cps |
-
0
- US US3284577D patent/US3284577A/en not_active Expired - Lifetime
-
1964
- 1964-01-24 GB GB3195/64A patent/GB1009247A/en not_active Expired
- 1964-04-20 SE SE4828/64A patent/SE313847B/xx unknown
- 1964-04-20 DE DE1964A0045803 patent/DE1244870C2/de not_active Expired
- 1964-10-05 BE BE653947D patent/BE653947A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1244870B (de) | 1967-07-20 |
| DE1244870C2 (de) | 1974-12-12 |
| US3284577A (en) | 1966-11-08 |
| SE313847B (xx) | 1969-08-25 |
| GB1009247A (en) | 1965-11-10 |