262609
In 1939 , a small number of Ultra-ShKAS were produced featuring a firing rate of 3,000 rounds per minute , but these saw only limited use due to reliability problems .
 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