Specification for direct - acting electrical recording measuring instruments and their accessories / 
British Standards Institution 
 - 43 leaves :  illustrations ;  30 cm. 
 - British standard ;  BS 90 : 1975 .
 - British standard ;  BS 90 : 1975 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical measuring instruments--Standards.<br/>Electrical testing--Standards.