A probe head including an elastic membrane capable of exerting a restoring force when one of the surfaces of the elastic membrane is distorted. A conductive probe includes a beam having a first end and a second end, with a probe tip proximate the first end for contacting a device under test. A beam contact proximate the second end of the beam. The beam being movable to deform at least one surface of the elastic membrane.

 
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< Liquid crystal device for compensating for aberration, optical pickup including liquid crystal device, and optical recording and/or reproducing apparatus employing optical pickup

> Water dispersible polythiophenes made with polymeric acid colloids

~ 00430