Sales, Promotion and Product Dif-ferentiation in Two Prescription Drug Markets

A high-voltage single-pole double-break switch assembly characterized by two outer, fixed, diverging, coplanar insulators whose inner adjacent ends are anchored to a base, and whose outer ends are free and carry switch contacts. Intermediate the outer insulators is an inner insulator journaled on the base for rotation about its own longitudinal axis. The inner insulator carries a switch blade whose outer ends simultaneously engage and disengage the switch contacts with rotation of the insulator. With the blade engaging the contacts, the blade and the two outer insulators bound a substantially triangular zone, one apex of which is adjacent the base.