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
Application number
DENDAT87511D
Other languages
German (de)
English (en)
Publication of DE87511C publication Critical patent/DE87511C/de
Active legal-status Critical Current

Links

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)
DENDAT87511D Active DE87511C (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
DE87511C true DE87511C (enrdf_load_stackoverflow)

Family

ID=359480

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT87511D Active DE87511C (enrdf_load_stackoverflow)

Country Status (1)

Country Link
DE (1) DE87511C (enrdf_load_stackoverflow)

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