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GB1365000A   [0004] 
DE2602511   [0004] 
US5431194A   [0004] 
US6450208B   [0004] 
US20140083553A   [0027]  [0027]  [0027] 
US9169584B   [0028]  [0031] 
US7992596B   [0028]  [0031]