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US6303833B   [0027] 
US6303533B   [0027] 
US5482908A   [0028] 
US5783513A   [0028] 
US5158922A   [0029]  [0030] 
EP798299A   [0038] 
EP896009A   [0038] 
EP962454A   [0038] 
EP962455A   [0038] 
US4324879A   [0038] 
US4288586A   [0038] 
DE3100262A   [0038] 
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DE3033860A   [0038] 
DE3144672A   [0038]