Description  Claims  Drawing  Cited references 

EP0486947A1   [0003] 
EP2194617A1   [0003] 
CN201142486Y   [0003] 
US2013109205A1   [0003] 
EP1489703A1   [0003] 
DE1540294A1   [0003] 

International Standard IEC 60884-1   [0014]