The 5271 was used on the pri side of 9188AAA, 3310P 3878261 EH, 3310-2S. The 4053 used a 5584 (4053P 3923289 later issue). Also 3828 was used 4053P 3923289 Possible later issue. I don't see where a 5271 was used on a 4053 ...
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