Cite
MLA Citation
British Standards Institution,. Aerospace series. Steel FE-PL31. Hardened and tempered. Hollow bars. 3, 5 mm ≤ a ≤ 55 mm.. London : British Standards Institution, 2018. http://access.bl.uk/ark:/81055/vdc_100173646602.0x000001
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British Standards Institution,. Aerospace series. Steel FE-PL31. Hardened and tempered. Hollow bars. 3, 5 mm ≤ a ≤ 55 mm.. London : British Standards Institution, 2018. http://access.bl.uk/ark:/81055/vdc_100173646602.0x000001