NL64018C - - Google Patents
Info
- Publication number
- NL64018C NL64018C NL64018DA NL64018C NL 64018 C NL64018 C NL 64018C NL 64018D A NL64018D A NL 64018DA NL 64018 C NL64018 C NL 64018C
- Authority
- NL
- Netherlands
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D213/86—Hydrazides; Thio or imino analogues thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
-
- 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
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Telephonic Communication Services (AREA)
- Electrotherapy Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13664/38A GB514520A (en) | 1938-05-07 | 1938-05-07 | Improvements in or relating to alternating current signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
NL64018C true NL64018C (de) |
Family
ID=10027155
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL93258D NL93258C (de) | 1938-05-07 | ||
NL64018D NL64018C (de) | 1938-05-07 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL93258D NL93258C (de) | 1938-05-07 |
Country Status (4)
Country | Link |
---|---|
US (1) | US2282129A (de) |
BE (1) | BE434099A (de) |
GB (1) | GB514520A (de) |
NL (2) | NL64018C (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB654639A (en) * | 1947-02-07 | 1951-06-27 | Standard Telephones Cables Ltd | Improvements in or relating to electric signalling systems |
NL81147C (de) * | 1951-04-27 | |||
JPS5340824A (en) * | 1976-09-27 | 1978-04-13 | Hitachi Ltd | Combining circuit |
-
0
- NL NL93258D patent/NL93258C/xx active
- BE BE434099D patent/BE434099A/xx unknown
- NL NL64018D patent/NL64018C/xx active
-
1938
- 1938-05-07 GB GB13664/38A patent/GB514520A/en not_active Expired
-
1939
- 1939-04-22 US US269524A patent/US2282129A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
BE434099A (de) | |
GB514520A (en) | 1939-11-10 |
US2282129A (en) | 1942-05-05 |
NL93258C (de) |