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This forced EOC to survive on export orders for both muzzle-loaders and breech-loaders until the 1880s when the British Government again began buying guns from EOC , this time rifled breech-loaders with more robust interrupted screw breech mechanisms such as the de Bange system and its successors .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None