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Standards
ANSI B16.5
JIS B 2220 :2004
BS10: 1962
DIN 2632, 2633, 2576, 2566, 2642, 2527 PN10 and PN16 Flanges
BS4504: Part 1: 1969
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BS4504: 3.1: 1989
Spectacle Blinds