FR565628A - - Google Patents
Info
- Publication number
- FR565628A FR565628A FR565628DA FR565628A FR 565628 A FR565628 A FR 565628A FR 565628D A FR565628D A FR 565628DA FR 565628 A FR565628 A FR 565628A
- Authority
- FR
- France
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR565628A true FR565628A (forum.php) | 1924-01-31 |
Family
ID=1539025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR565628D Expired FR565628A (forum.php) |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR565628A (forum.php) |
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0
- FR FR565628D patent/FR565628A/fr not_active Expired