ES429964A1 - Perfeccionamientos introducidos en conjuntos de vias fe- rreas. - Google Patents
Perfeccionamientos introducidos en conjuntos de vias fe- rreas.Info
- Publication number
- ES429964A1 ES429964A1 ES429964A ES429964A ES429964A1 ES 429964 A1 ES429964 A1 ES 429964A1 ES 429964 A ES429964 A ES 429964A ES 429964 A ES429964 A ES 429964A ES 429964 A1 ES429964 A1 ES 429964A1
- Authority
- ES
- Spain
- Prior art keywords
- base
- plate
- seat
- width
- filling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Connection Of Plates (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4587773A GB1482629A (en) | 1973-09-11 | 1973-09-11 | Tone detectors |
Publications (1)
Publication Number | Publication Date |
---|---|
ES429964A1 true ES429964A1 (es) | 1976-09-16 |
Family
ID=10438949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES429964A Expired ES429964A1 (es) | 1973-09-11 | 1974-09-11 | Perfeccionamientos introducidos en conjuntos de vias fe- rreas. |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE819732A (es) |
ES (1) | ES429964A1 (es) |
GB (1) | GB1482629A (es) |
IT (1) | IT1020760B (es) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4164036A (en) * | 1977-12-07 | 1979-08-07 | Honeywell Inc. | Quadrature correlation phase reversal pulse detector |
US4216463A (en) * | 1978-08-10 | 1980-08-05 | Motorola, Inc. | Programmable digital tone detector |
FR2451691A1 (fr) * | 1979-03-16 | 1980-10-10 | Thomson Csf | Circuit comparateur de frequences et dispositif d'appel selectif comportant un tel circuit |
JPS59140739A (ja) * | 1983-01-31 | 1984-08-13 | Sony Corp | Amステレオ受信機のパイロット信号検出回路 |
US4698769A (en) * | 1985-02-04 | 1987-10-06 | American Telephone And Telegraph Company | Supervisory audio tone detection in a radio channel |
US4783845A (en) * | 1985-12-20 | 1988-11-08 | Itt Aerospace Optical | Digital tone squelch detector |
-
1973
- 1973-09-11 GB GB4587773A patent/GB1482629A/en not_active Expired
-
1974
- 1974-09-10 IT IT6973574A patent/IT1020760B/it active
- 1974-09-10 BE BE148372A patent/BE819732A/xx not_active IP Right Cessation
- 1974-09-11 ES ES429964A patent/ES429964A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE819732A (fr) | 1974-12-31 |
GB1482629A (en) | 1977-08-10 |
IT1020760B (it) | 1977-12-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FD1A | Patent lapsed |
Effective date: 20100528 |