This is a suit under Section 4915 of the Revised Statutes as amended, 35 U.S.C.A. § 63, to cancel trade-mark registration No. 32,900, issued May 16, 1899 to Vacuum Oil Company, defendant's predecessor, and renewed May 16, 1929 by defendant, covering the mark "Viscolite" for "lubricating-oils".
Plaintiff is the owner of trade-mark registration No. 337,509, issued August 11, 1936, covering...
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