involving prisms or mirrors (G02B23/14 takes precedence)

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Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices > involving prisms or mirrors (G02B23/14 takes precedence)

Child Classifications

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• G02B 23/04 for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer (G02B23/10 takes precedence)
• G02B 23/06 having a focussing action, e.g. parabolic mirror
• G02B 23/08 Periscopes
• G02B 23/10 reflecting into the field of view additional indications, e.g. from collimator