NL278489A - - Google Patents
Info
- Publication number
- NL278489A NL278489A NL278489DA NL278489A NL 278489 A NL278489 A NL 278489A NL 278489D A NL278489D A NL 278489DA NL 278489 A NL278489 A NL 278489A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Relay Circuits (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE40732 | 1961-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL278489A true NL278489A (en:Method) |
Family
ID=3840264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL278489D NL278489A (en:Method) | 1961-06-15 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3200307A (en:Method) |
| DE (1) | DE1163916B (en:Method) |
| NL (1) | NL278489A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3388389A (en) * | 1964-06-09 | 1968-06-11 | Davis Foreman | Alarm systems |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE21659E (en) * | 1940-12-17 | Telephone signal system | ||
| US2287926A (en) * | 1938-03-04 | 1942-06-30 | Rca Corp | Signal actuated alarm circuit |
| US2319306A (en) * | 1941-10-31 | 1943-05-18 | Bell Telephone Labor Inc | Signaling system |
| US2907012A (en) * | 1955-12-30 | 1959-09-29 | Pitman Duncan | Sofar alarm |
| NL238413A (en:Method) * | 1958-04-28 | |||
| US3078444A (en) * | 1960-03-11 | 1963-02-19 | Zenith Radio Corp | Remote control system |
-
0
- NL NL278489D patent/NL278489A/xx unknown
-
1962
- 1962-06-11 US US201699A patent/US3200307A/en not_active Expired - Lifetime
- 1962-06-14 DE DEJ21937A patent/DE1163916B/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1163916B (de) | 1964-02-27 |
| US3200307A (en) | 1965-08-10 |