FR991235A - Optical device - Google Patents

Optical device

Info

Publication number
FR991235A
FR991235A FR991235DA FR991235A FR 991235 A FR991235 A FR 991235A FR 991235D A FR991235D A FR 991235DA FR 991235 A FR991235 A FR 991235A
Authority
FR
France
Prior art keywords
optical device
optical
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
Application number
Other languages
French (fr)
Inventor
Paul Gerard
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR991235A publication Critical patent/FR991235A/en
Expired legal-status Critical Current

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
    • G02B27/02—Viewing or reading apparatus
    • G02B27/022—Viewing apparatus
    • G02B27/024—Viewing apparatus comprising a light source, e.g. for viewing photographic slides, X-ray transparancies
    • G02B27/025—Viewing apparatus comprising a light source, e.g. for viewing photographic slides, X-ray transparancies and magnifying means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
FR991235D 1949-05-12 1949-05-12 Optical device Expired FR991235A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR991235T 1949-05-12

Publications (1)

Publication Number Publication Date
FR991235A true FR991235A (en) 1951-10-03

Family

ID=9550545

Family Applications (1)

Application Number Title Priority Date Filing Date
FR991235D Expired FR991235A (en) 1949-05-12 1949-05-12 Optical device

Country Status (1)

Country Link
FR (1) FR991235A (en)

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