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EOC 's main customer in its early years was the British Government , but the Government abandoned " Armstrong guns " in the mid-1860s due to dissatisfaction with Armstrong 's breech mechanism , and instead built its own rifled muzzle-loaders at Woolwich Arsenal ( " Woolwich guns " ) until 1880 .
 Armstrong, Armstrong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Armstrong, Armstrong