DE87511C - - Google Patents
Info
- Publication number
- DE87511C DE87511C DENDAT87511D DE87511DA DE87511C DE 87511 C DE87511 C DE 87511C DE NDAT87511 D DENDAT87511 D DE NDAT87511D DE 87511D A DE87511D A DE 87511DA DE 87511 C DE87511 C DE 87511C
- Authority
- DE
- Germany
- Prior art keywords
- field
- vision
- frame
- visor
- arm
- 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.)
- Active
Links
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/14—Devices for drawing in perspective
- B43L13/16—Devices for drawing in perspective free-hand
- B43L13/18—Devices for drawing in perspective free-hand having optical or projecting equipment
Landscapes
- Eye Examination Apparatus (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE87511C true DE87511C (forum.php) |
Family
ID=359480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT87511D Active DE87511C (forum.php) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE87511C (forum.php) |
-
0
- DE DENDAT87511D patent/DE87511C/de active Active
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