901
in 1882 louis developed a method of making photographic plates , and by 1894 the brothers ' factory was producing 15 million plates a year .
 product producer: factory, plates
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  factory, plates 
Answer:
 product producer: factory, plates