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LM2902-N: LM2902-N application question

Part Number: LM2902-N
Other Parts Discussed in Thread: LM2902

Hi team,

My customer have a question regarding LM2902 , 

what situation or application of LM2902 circuit need to add dual common base-collector bias resistor transistors?

please kindly help to resolve the question or give some suggestion , thank you very much!

Andy