NL217246A - - Google Patents
Info
- Publication number
- NL217246A NL217246A NL217246DA NL217246A NL 217246 A NL217246 A NL 217246A NL 217246D A NL217246D A NL 217246DA NL 217246 A NL217246 A NL 217246A
- Authority
- NL
- Netherlands
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL848928X | 1957-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL217246A true NL217246A (forum.php) |
Family
ID=19845281
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL108245D NL108245C (forum.php) | 1957-05-13 | ||
| NL217246D NL217246A (forum.php) | 1957-05-13 |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL108245D NL108245C (forum.php) | 1957-05-13 |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB848928A (forum.php) |
| NL (2) | NL217246A (forum.php) |
-
0
- NL NL108245D patent/NL108245C/xx active
- NL NL217246D patent/NL217246A/xx unknown
-
1958
- 1958-05-12 GB GB15199/58A patent/GB848928A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL108245C (forum.php) | |
| GB848928A (en) | 1960-09-21 |