British industries fair
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Article
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1939
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Wiley (John Wiley & Sons)
โ 505 KB
J'lic npptiratiis is kcpt iiwiy I'rom tlic dniigcr i t m i , :md tlic contnincr is brouglit to i t niid couplcd up. t\ hydrogen fliinic, fctl froni tlic spccial cylinrlcr on tlic Icft, is tlicri burnt in tlic Iii~iil> housing, iind iidjustcd to :I I d g b t of 10 111111. by the iiiicro tiip u~iclcrn