A hollow box-shaped mover or a needle is moved, without using a power transmission mechanism midway, to a portion according to a measured value of a graduation portion, by housing the mover between a dial and a surrounding facing and in a guide groove portion formed along a graduation portion, in a manner...http://www.google.fr/patents/US7573255?utm_source=gb-gplus-shareBrevet US7573255 - Meter
