Specification for unused mineral insulting oils for transformers and switchgear / 
British Standards Institution. 
 - 15 pages :  illustrations ;  33cm. 
 - British standard ;  BS 148 : 1984 .
 - British standard ;  BS 148 : 1984 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric insulators and insulation--Oils.<br/>Electric insulators and insulation--Liquids.