1900

À°¾È/±¤ÇÐ °Ë»ç (Visual/Optical Inspection)

1901  »ê¾÷¿ë ³»½Ã°æ (fiberscope)
1902  ¿­È­»ó Ä«¸Þ¶ó (IR camera)
1903  È¦·Î±×·¡ÇÇ (holography)

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