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with movable lens means specially adapted for focusing at close distances
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Industry
CPC
G02B15/22
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Parent Industries
G
PHYSICS
G02
Optics
G02B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
G02B15/00
Optical objectives with means for varying the magnification
Current Industry
G02B15/22
with movable lens means specially adapted for focusing at close distances
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