Indian Standards Institution <br/><br/>
IS: 13947 - Part 5 - Section 1 - 1993 (Amendment No.1 - 1997); Specification for Low-Voltage Switchgear and Controlgear Part 5; Control Circuit Devices and Switchgear Elements Section 1; Electromechanical Control Circuit Devices 

 - New Delhi  BIS  1997 
 - 19p 
<br/><br/><label>Universal Decimal Class. No.: </label> /