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US4413066A   [0010] 
US4297310A   [0010] 
US4351876A   [0010] 
US4397981A   [0010] 
US4446283A   [0010] 
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US3646155A   [0010] 
US4117195A   [0010] 
WO9517463A   [0017] 
EP1309631A   [0017] 
EP1309632A   [0017]