Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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9/00
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
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G02B9/12
having three components only
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G02B9/24
two of the components having compound lenses
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G02B9/26
the front and rear components having compound lenses
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