Description  Claims  Drawing  Cited references 

WO9503268A   [0011] 
WO2013093028A   [0011] 
US2710880A   [0012] 
GB173479A   [0012] 
GB280969A   [0013] 
US20090093034A   [0015] 
US20120116100A   [0016] 
US20110155557A   [0017] 
WO2012110117A   [0018] 
US5420304A   [0019]