Description     Claims     Drawing  

US4822415A   [0003]  [0003] 
US4389251A   [0003]  [0003] 
US4078958A   [0003]  [0003] 
DE3623972   [0003]  [0003] 
WO8100082A1   [0003] 
WO8100082A   [0003]