NL65873C - - Google Patents
Info
- Publication number
- NL65873C NL65873C NL124164A NL124164A NL65873C NL 65873 C NL65873 C NL 65873C NL 124164 A NL124164 A NL 124164A NL 124164 A NL124164 A NL 124164A NL 65873 C NL65873 C NL 65873C
- Authority
- NL
- Netherlands
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/38—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D307/40—Radicals substituted by oxygen atoms
- C07D307/46—Doubly bound oxygen atoms, or two oxygen atoms singly bound to the same carbon atom
- C07D307/48—Furfural
- C07D307/50—Preparation from natural products
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US529506A US2524773A (en) | 1944-04-04 | 1944-04-04 | Calling party identification for automatic telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL65873C true NL65873C (de) | 1950-06-15 |
Family
ID=24110189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL124164A NL65873C (de) | 1944-04-04 | 1946-03-19 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2524773A (de) |
| CH (1) | CH258727A (de) |
| FR (1) | FR920968A (de) |
| GB (1) | GB597163A (de) |
| NL (1) | NL65873C (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE522252A (de) * | 1952-08-23 | |||
| US2806091A (en) * | 1953-02-27 | 1957-09-10 | Bell Telephone Labor Inc | Multiparty identification system |
| US2820100A (en) * | 1954-02-26 | 1958-01-14 | Bell Telephone Labor Inc | Station identification device |
| US2817710A (en) * | 1954-07-14 | 1957-12-24 | Bell Telephone Labor Inc | Multiparty telephone system |
| US3046349A (en) * | 1959-04-27 | 1962-07-24 | Automatic Elect Lab | Station identification apparatus |
| US3070664A (en) * | 1959-12-04 | 1962-12-25 | Automatic Elect Lab | Calling party identification systems |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2281508A (en) * | 1940-02-02 | 1942-04-28 | Bell Telephone Labor Inc | Telephone system |
| US2306173A (en) * | 1940-06-12 | 1942-12-22 | Bell Telephone Labor Inc | Telephone system |
| US2277206A (en) * | 1940-06-22 | 1942-03-24 | Bell Telephone Labor Inc | Key sender |
| US2326679A (en) * | 1940-07-11 | 1943-08-10 | Bell Telephone Labor Inc | Party line telephone system |
| US2410520A (en) * | 1941-07-26 | 1946-11-05 | Automatic Elect Lab | Telephone system |
| US2347108A (en) * | 1943-02-05 | 1944-04-18 | Bell Telephone Labor Inc | Call transmitter for telephone signaling systems |
| US2406001A (en) * | 1944-02-24 | 1946-08-20 | Int Standard Electric Corp | Electrical signaling system |
-
1944
- 1944-04-04 US US529506A patent/US2524773A/en not_active Expired - Lifetime
-
1945
- 1945-01-12 GB GB995/45A patent/GB597163A/en not_active Expired
- 1945-06-04 CH CH258727D patent/CH258727A/de unknown
-
1946
- 1946-01-31 FR FR920968D patent/FR920968A/fr not_active Expired
- 1946-03-19 NL NL124164A patent/NL65873C/xx active
Also Published As
| Publication number | Publication date |
|---|---|
| GB597163A (en) | 1948-01-20 |
| US2524773A (en) | 1950-10-10 |
| FR920968A (fr) | 1947-04-23 |
| CH258727A (de) | 1948-12-15 |