Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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15/00
Optical objectives with means for varying the magnification
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G02B15/14
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
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G02B15/143
having three groups only
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G02B15/1431
the first group being positive
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