NL28920C - - Google Patents
Info
- Publication number
- NL28920C NL28920C NL28920DA NL28920C NL 28920 C NL28920 C NL 28920C NL 28920D A NL28920D A NL 28920DA NL 28920 C NL28920 C NL 28920C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/668—Means for obtaining or monitoring the vacuum
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US279154A US1731866A (en) | 1928-05-19 | 1928-05-19 | Circuit-controlling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL28920C true NL28920C (ru) |
Family
ID=23067861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL28920D NL28920C (ru) | 1928-05-19 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1731866A (ru) |
| BE (2) | BE283147A (ru) |
| GB (1) | GB312084A (ru) |
| NL (1) | NL28920C (ru) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7499255B2 (en) * | 2006-01-31 | 2009-03-03 | Thomas & Betts International, Inc. | Vacuum-type electrical switching apparatus |
| ITMI20071511A1 (it) * | 2007-07-26 | 2009-01-27 | Elettrotec Srl | "vuotostato elettronico con parametri principali settabili rapidamente anche durante il funzionamento dell'impianto sotto controllo" |
-
0
- BE BE360836D patent/BE360836A/xx unknown
- NL NL28920D patent/NL28920C/xx active
- BE BE283147D patent/BE283147A/xx unknown
-
1928
- 1928-05-19 US US279154A patent/US1731866A/en not_active Expired - Lifetime
-
1929
- 1929-05-17 GB GB15493/29A patent/GB312084A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE283147A (ru) | |
| BE360836A (ru) | |
| US1731866A (en) | 1929-10-15 |
| GB312084A (en) | 1930-10-17 |