Electrical indicating instruments 

 - London :   British Standards House,   1954. 
 - p. 51 
 - B.S. 89: 1954 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>INSTRUMENTOS ELECTRICOS<br/>NORMAS<br/>B.S. 89
<br/><br/><label>Universal Decimal Class. No.: </label>[083.47]