Opinion of the Court by MR. JUSTICE DOUGLAS, announced by MR. JUSTICE BLACK.
Petitioner is a manufacturer of spark plugs which it sells under the trade mark "Champion." Respondents collect the used plugs, repair and recondition them, and resell them. Respondents retain the word "Champion" on the repaired or reconditioned plugs. The outside box or carton in which the plugs are packed has stamped on it the word "Champion," together with the letter and figure denoting...
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