Cite
MLA Citation
British Standards Institution,. Gas cylinders. Specifications and testing of LPG cylinder valves. Self-closing.. London : British Standards Institution, 2019. http://access.bl.uk/ark:/81055/vdc_100105205747.0x000001
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British Standards Institution,. Gas cylinders. Specifications and testing of LPG cylinder valves. Self-closing.. London : British Standards Institution, 2019. http://access.bl.uk/ark:/81055/vdc_100105205747.0x000001