Japan, Dec. 8 -- 株式会社サカタのタネ holds the trademark for 'ＲＦ.' Other related details are as follows:
Application Number: Reg.No.6988529
Class: 31
Status: LIVE-REGISTRATION-Published for Opposition
Filing Date: Feb. 28
Registration Date: Nov. 20
The original document can be viewed at: https://www.j-platpat.inpit.go.jp/c1801/TR/JP-2025-021119/40/en
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