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 · O-ring Sigry Surface O, 0, brownish O-ring sign EIITO, NBI . 63R. A B c D E G Imm Z h', 6 (6) perspective . fiBJ3 Nñ'hperspective Vol.3No.f (7) 7 . A fif9J4 O-ring sign 8 (8)

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