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G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
G02B23/2407—Optical details
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
G01N33/389—Precious stones; Pearls
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Physics & Mathematics
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Life Sciences & Earth Sciences
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General Physics & Mathematics
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Health & Medical Sciences
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Food Science & Technology
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Optics & Photonics
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Engineering & Computer Science
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Astronomy & Astrophysics
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Medicinal Chemistry
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Analytical Chemistry
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Biochemistry
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General Health & Medical Sciences
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Immunology
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Pathology
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Farming Of Fish And Shellfish
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Investigating Materials By The Use Of Optical Means Adapted For Particular Applications
(AREA)