Cite
MLA Citation
British Standards Institution,. Circular flanges for pipes, valves and fittings (PN designated).. London : British Standards Institution, 1989. http://access.bl.uk/ark:/81055/vdc_100104955945.0x000001
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British Standards Institution,. Circular flanges for pipes, valves and fittings (PN designated).. London : British Standards Institution, 1989. http://access.bl.uk/ark:/81055/vdc_100104955945.0x000001