BE421705A - - Google Patents
Info
- Publication number
- BE421705A BE421705A BE421705DA BE421705A BE 421705 A BE421705 A BE 421705A BE 421705D A BE421705D A BE 421705DA BE 421705 A BE421705 A BE 421705A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42F—SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
- B42F13/00—Filing appliances with means for engaging perforations or slots
- B42F13/16—Filing appliances with means for engaging perforations or slots with claws or rings
- B42F13/20—Filing appliances with means for engaging perforations or slots with claws or rings pivotable about an axis or axes parallel to binding edges
- B42F13/28—Filing appliances with means for engaging perforations or slots with claws or rings pivotable about an axis or axes parallel to binding edges in two staggered sections
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US668506A US2084772A (en) | 1933-04-29 | 1933-04-29 | Sodium vapor lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE421705A true BE421705A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
Family
ID=24682569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE421705D BE421705A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1933-04-29 |
Country Status (5)
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2687471A (en) * | 1948-05-01 | 1954-08-24 | Western Union Telegraph Co | Concentrated arc discharge device |
| US4691169A (en) * | 1979-03-15 | 1987-09-01 | Baum Robert A | Electrode assembly especially adapted to utilizing a magnetic field for measuring electric conductivity of treated non-polar liquids |
| EP0440300B1 (en) * | 1990-02-02 | 1995-04-26 | Koninklijke Philips Electronics N.V. | Electrodeless low-pressure discharge lamp |
| DE29924000U1 (de) * | 1999-09-28 | 2002-01-03 | PharmaServ Marburg GmbH & Co. KG, 35041 Marburg | Leitfähigkeitssensor |
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0
- BE BE421705D patent/BE421705A/xx unknown
- NL NL38561D patent/NL38561C/xx active
-
1933
- 1933-04-29 US US668506A patent/US2084772A/en not_active Expired - Lifetime
-
1934
- 1934-03-26 GB GB9477/34A patent/GB421705A/en not_active Expired
- 1934-04-13 FR FR771823D patent/FR771823A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2084772A (en) | 1937-06-22 |
| GB421705A (en) | 1934-12-28 |
| FR771823A (fr) | 1934-10-18 |
| NL38561C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |