In economics. The combined action of numbers. It is of two distinct kinds: (1) Such cooperation as takes place when several persons help each other in the same employment; (2) such cooperation as takes place when several persons help each other in different employments. These may be termed “simple cooperation” and “complex cooperation.” Mill, Pol. Ec. 142. In patent law. Unity of action to a common end or a common result not merely joint or simultaneous action. Boynton Co. v. Morris Chute Co. (C. C.) 82 Fed. 444; Fastener Co. v. Webb (C. C.) 89 Fed. 987; Holmes, etc., Tel. Co. v. Domestic, etc., Tel. Co. (C. C.) 42 Fed. 227.