From tiie nature of the residue*-left after distillation, crude oil is commonly classified as paraffin ha'se or asphalt base. 'When it contains both, it is known as mixed base.
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https://paperspast.natlib.govt.nz/newspapers/OPNEWS19380506.2.20.1
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Opotiki News, Volume I, Issue 30, 6 May 1938, Page 3
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29Page 3 Advertisements Column 1 Opotiki News, Volume I, Issue 30, 6 May 1938, Page 3
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