GB520554A - Improvements in or relating to portable electric hand lamps for use in mines - Google Patents
Improvements in or relating to portable electric hand lamps for use in minesInfo
- Publication number
- GB520554A GB520554A GB30867/38A GB3086738A GB520554A GB 520554 A GB520554 A GB 520554A GB 30867/38 A GB30867/38 A GB 30867/38A GB 3086738 A GB3086738 A GB 3086738A GB 520554 A GB520554 A GB 520554A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mines
- relating
- portable electric
- electric hand
- lamps
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
- F21L4/00—Electric lighting devices with self-contained electric batteries or cells
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
520,554. Battery lamps, STOPPEL, P., and FRIEMANN & WOLF GES. Oct. 25, 1938, No. 30867. Drawings to Specification. [Class 39 (ii)] All the current connections in a battery lamp are soldered or welded together, with the exception of the switching connection and including the connections between the lamp filament and the circuit terminals. In the case of plug-connected lamps no plugs are soldered in with readily fusible high conductivity solder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB30867/38A GB520554A (en) | 1938-10-25 | 1938-10-25 | Improvements in or relating to portable electric hand lamps for use in mines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB30867/38A GB520554A (en) | 1938-10-25 | 1938-10-25 | Improvements in or relating to portable electric hand lamps for use in mines |
Publications (1)
Publication Number | Publication Date |
---|---|
GB520554A true GB520554A (en) | 1940-04-26 |
Family
ID=10314370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30867/38A Expired GB520554A (en) | 1938-10-25 | 1938-10-25 | Improvements in or relating to portable electric hand lamps for use in mines |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB520554A (en) |
-
1938
- 1938-10-25 GB GB30867/38A patent/GB520554A/en not_active Expired
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