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The R1155 and T1154 sets were manufactured by several British radio manufacturers , including EKCO , Marconi , Plessey , and EMI .
 EKCO, Marconi, Plessey, EMI
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 EKCO, Marconi, Plessey, EMI