McENTEE, Circuit Judge.
On July 6, 1973, the Commissioner of Food and Drugs published a new regulation intended to limit the presence in human and animal foods of certain toxic chemicals known collectively as polychlorinated biphenyls (PCB's). Among other things, the new regulation prohibited PCB residues of more than ten parts per million (ppm) in most paper food-packaging materials. 38 Fed.Reg. 18096, 18101-02, (1973) (to be codified at 21 C.F.R. § 122.10(a...
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