What is the difference between using WPI and INPADOC for patent searches?

According to MPEP 901.07, there are key differences in how USPTO examiners use the World Patents Index (WPI) and International Patent Documentation Center (INPADOC) databases: WPI: Preferred for more comprehensive searches. The MPEP states: WPI in-house is used whenever abstracts are needed or when searches in addition to publication date or patent family are required,…

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