Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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23/00
Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
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G02B23/02
involving prisms or mirrors
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G02B23/04
for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer
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