Carnation Co v Quebec (Agricultural Marketing Board)
238 is a leading constitutional decision of the Supreme Court of Canada on the federal authority over trade and commerce under section 91 ( 2 ) of the "Constitution Act , 1867" . 
<triplet> trade and commerce <subj> Constitution Act, 1867 <obj> part of <triplet> Constitution Act, 1867 <subj> constitutional <obj> instance of <subj> 1867 <obj> point in time