ated to prevent competition and to create a monopoly in the production and. sale of tabulating cards suitable for appellant’s machines, as the district court found. The commerce in tabulating cards is substantial. Appellant makes and sells 3,000,000,000 cards annually, 81% of the total, indicating that the sales by the Remington Rand company, its only competitor, representing the remaining 19%, are approximately 600,000,000. It is stipulated that appellant derives a “substantial” profit from its card sales. The gross receipts from its machines during the past ten years have averaged $9,710,389 a year; and an average of $3,192,700 has been derived annually from the sale of its cards. These facts, and others, which we do not stop to enumerate, can leave no doubt that the effect of the condition in appellant’s leases “may be to substantially lessen competition,” and that it tends to create monopoly, and has in fact been an important and effective step in the creation of monopoly.
2. On the trial appellant offered to prove its ownership of patents which, it asserts, give. it. a monopoly of the right to manufacture, use and vend the cards, separately, and in combination with its sorting and tabulating machines, of which, it insists, they are a part. It argues that the condition of its leases is lawful because it does not enlarge the monopoly secured by the patents, and that the trial court erred in refusing to consider appellant’s patent monopoly as a defense to the suit.
Appellant’s patents appear to extend only to the cards when perforated, and to have no application to those which the lessees purchase before they are punched. The contention is thus reduced to the dubious claim that the sale of the un-punched cards is a contributory infringement of the patents covering the use of perforated cards separately and in combination with the machines. See Carbice Corporation v. American Patents Development Corp., 283 U. S. 27; Motion Picture Patents Co. v. Uni