Files with jpo suffix can be usually found as special data files used by the Japanese National Center for Industrial Property Information and Training (INPIT).
JPO file - JPO data format
What is jpo file? How to open jpo files?
File type specification:
File extension jpo is most likely best known for its use for JPO data file format.
Japio’s JPO data service offers standardized JPO data prepared by National Center for Industrial Property Information and Training (INPIT) Japanese Government office, as well as original JPO data, for marginal cost.
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