Joseph McKenna, United States v. United Shoe Machinery Company of New Jersey…
“ And the government has taken pains to tell us how far 'the mysteries of the shoemaker's art and the variations between different methods of making shoes' are outside of the understanding of the purchaser of them. To him, it is said, 'shoes are shoes, except as they differ in appearance, comfort, wearing qualities, and price.' But to the manufacturer distinctions multiply and to the production of a shoe a complete line of machinery is necessary. Indeed, the government makes the mystery of the art and the necessity of the instrumentalities, in part, the basis of its argument. ”
