A hand-operated test head positioner for positioning the test head of a semiconductor device testing apparatus is provided which is easy to operate, highly safe in operation, and yet inexpensive. Two air cylinders are installed one at each of two opposed positions of the test head. The sum of driving...http://www.google.se/patents/US6271657?utm_source=gb-gplus-sharePatent US6271657 - Test head positioner for semiconductor device testing apparatus
