An optical input device for measuring the movement of a finger ia accommodated in a housing provided with a transparent window for transmitting a measurement beam from a diode laser to the finger and radiation reflected by the finger to a detector. In other aspects the invention relates to the use of these compounds in a method for therapy and to pharmaceutical compositions comprising the compounds of the invention. The module may process the diagnostic messages to obtain network status information indicative of the status of a radio network. The movable magnetron can be mounted on an arm pivoting about an axis at periphery of a rotating disk-shaped plate mounting the stationary magnetron so the arm centrifugally moves between radial positions dependent upon the rotation rate or direction. passing the second portion of natural gas discharged from the gas compressor to the aftercooler without passing it through the heat exchanger, the second portion of gas and the first portion of gas being mixed at the aftercooler inlet and cooled by the aftercooler and discharged from the aftercooler as a cooled gas stream having a temperature no greater than a first temperature; e.