IT500077A - - Google Patents
Info
- Publication number
- IT500077A IT500077A IT500077DA IT500077A IT 500077 A IT500077 A IT 500077A IT 500077D A IT500077D A IT 500077DA IT 500077 A IT500077 A IT 500077A
- Authority
- IT
- Italy
Links
Classifications
-
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/16—Electric signal transmission systems in which transmission is by pulses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
-
- 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
- H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1052056T | 1952-03-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT500077A true IT500077A (xx) |
Family
ID=9595063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT500077D IT500077A (xx) | 1952-03-04 |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH308383A (xx) |
| FR (3) | FR1052056A (xx) |
| IT (1) | IT500077A (xx) |
| NL (2) | NL169510B (xx) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL270678A (xx) * | 1960-10-29 | |||
| US3529105A (en) * | 1967-02-15 | 1970-09-15 | Emerson Electric Co | Snap switch and thermoresponsive actuator |
-
0
- IT IT500077D patent/IT500077A/it unknown
- NL NL89644D patent/NL89644C/xx active
- NL NL7700447B patent/NL169510B/xx unknown
-
1952
- 1952-03-04 FR FR1052056D patent/FR1052056A/fr not_active Expired
- 1952-03-04 FR FR1052055D patent/FR1052055A/fr not_active Expired
- 1952-03-04 FR FR1052054D patent/FR1052054A/fr not_active Expired
-
1953
- 1953-03-02 CH CH308383D patent/CH308383A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR1052055A (fr) | 1954-01-21 |
| NL169510B (nl) | |
| CH308383A (fr) | 1955-07-15 |
| FR1052054A (fr) | 1954-01-21 |
| NL89644C (xx) | |
| FR1052056A (fr) | 1954-01-21 |