NL108245C - - Google Patents

Info

Publication number
NL108245C
NL108245C NL108245DC NL108245C NL 108245 C NL108245 C NL 108245C NL 108245D C NL108245D C NL 108245DC NL 108245 C NL108245 C NL 108245C
Authority
NL
Netherlands
Application number
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.)
Publication of NL108245C publication Critical patent/NL108245C/xx

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)
NL108245D 1957-05-13 NL108245C (zh)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL848928X 1957-05-13

Publications (1)

Publication Number Publication Date
NL108245C true NL108245C (zh)

Family

ID=19845281

Family Applications (2)

Application Number Title Priority Date Filing Date
NL217246D NL217246A (zh) 1957-05-13
NL108245D NL108245C (zh) 1957-05-13

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL217246D NL217246A (zh) 1957-05-13

Country Status (2)

Country Link
GB (1) GB848928A (zh)
NL (2) NL108245C (zh)

Also Published As

Publication number Publication date
GB848928A (en) 1960-09-21
NL217246A (zh)

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