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The searchlights were based around extremely high-powered Carbon Arc lamp s. 60 Centimetre These were developed in the late 1930s , with a 60 centimetre diameter parabolic glass reflector and was powered by an 8 kilowatt generator .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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