FR721275A - Frequency relays operating according to the ferrari principle - Google Patents
Frequency relays operating according to the ferrari principleInfo
- Publication number
- FR721275A FR721275A FR721275DA FR721275A FR 721275 A FR721275 A FR 721275A FR 721275D A FR721275D A FR 721275DA FR 721275 A FR721275 A FR 721275A
- Authority
- FR
- France
- Prior art keywords
- operating according
- frequency relays
- relays operating
- ferrari
- principle
- 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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/30—Electromagnetic relays specially adapted for actuation by AC
- H01H51/32—Frequency relays; Mechanically-tuned relays
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Treatment Devices (AREA)
- Electromagnets (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH382981X | 1930-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR721275A true FR721275A (en) | 1932-03-01 |
Family
ID=4513707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR721275D Expired FR721275A (en) | 1930-09-02 | 1931-08-12 | Frequency relays operating according to the ferrari principle |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE547455C (en) |
| FR (1) | FR721275A (en) |
| GB (1) | GB382981A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761999A (en) * | 1952-09-05 | 1956-09-04 | English Electric Co Ltd | Electrical relays |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1272435B (en) * | 1955-12-15 | 1968-07-11 | Sonceboz Sa | Self-starting synchronous motor |
| DE102006006324A1 (en) | 2006-02-11 | 2007-08-23 | H2O Gmbh | Device for the treatment of process or industrial wastewater |
-
1930
- 1930-09-23 DE DE1930547455D patent/DE547455C/en not_active Expired
-
1931
- 1931-08-12 FR FR721275D patent/FR721275A/en not_active Expired
- 1931-08-29 GB GB24349/31A patent/GB382981A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761999A (en) * | 1952-09-05 | 1956-09-04 | English Electric Co Ltd | Electrical relays |
Also Published As
| Publication number | Publication date |
|---|---|
| GB382981A (en) | 1932-11-10 |
| DE547455C (en) | 1932-03-23 |
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