Abstract  Description  Claims  Drawing  Search report  Cited references 

DE148622C   [0004]  [0006] 
DE166218C   [0004]  [0007] 
DE255173C   [0004]  [0008] 
EP2995508A1   [0004]  [0009] 
WO2018019540A1   [0004]  [0010] 
GB190207793A   [0005]  [0011] 
DE121019C   [0005]  [0012] 
WO2014140074A1   [0005]  [0013]