BE563510A - - Google Patents
Info
- Publication number
- BE563510A BE563510A BE563510DA BE563510A BE 563510 A BE563510 A BE 563510A BE 563510D A BE563510D A BE 563510DA BE 563510 A BE563510 A BE 563510A
- 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
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3089919X | 1956-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE563510A true BE563510A (mo) |
Family
ID=4574022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE563510D BE563510A (mo) | 1956-12-28 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3089919A (mo) |
| BE (1) | BE563510A (mo) |
| CH (1) | CH345370A (mo) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2330241A (en) * | 1941-10-17 | 1943-09-28 | W O Neil | Radio receiving device |
| US2589800A (en) * | 1950-05-19 | 1952-03-18 | Bell Telephone Labor Inc | Telephone signaling system |
| US2604545A (en) * | 1950-05-19 | 1952-07-22 | Bell Telephone Labor Inc | Party line station signaling system |
| US2759179A (en) * | 1952-12-05 | 1956-08-14 | Bell Telephone Labor Inc | Ringing circuit |
| BE538091A (mo) * | 1954-05-12 | |||
| US2823267A (en) * | 1956-03-29 | 1958-02-11 | Bell Telephone Labor Inc | Delay circuit for amplifying device |
| NL112535C (mo) * | 1956-06-07 | |||
| US3141068A (en) * | 1957-01-15 | 1964-07-14 | Robert t |
-
0
- BE BE563510D patent/BE563510A/xx unknown
-
1956
- 1956-12-28 CH CH345370D patent/CH345370A/fr unknown
-
1957
- 1957-12-23 US US704600A patent/US3089919A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CH345370A (de) | 1960-03-31 |
| US3089919A (en) | 1963-05-14 |