A positioning device for test heads, and the like, comprising: an upright stand having legs with leveling mechanisms; a vertically adjustable platform mounted on the stand; two symmetrically arranged pairs of arms mounted on the platform for articulated movement in a horizontal plane; a bracket rotatably...http://www.google.ca/patents/US4742980?utm_source=gb-gplus-sharePatent US4742980 - Positioning device for test heads
