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|Assignee=The Lang Pen Company Limited
 
|Assignee=The Lang Pen Company Limited
 
|Country=GB
 
|Country=GB
|ApplicationNum=1060752
+
|ApplicationNum=13149/50
 
|ApplicationDate=1950-05-25
 
|ApplicationDate=1950-05-25
 
|PatentNum=679065
 
|PatentNum=679065