An apparatus and method are provided to deliver a pair of output signals indicative of engine rotational speed andor generator rotational speed. The version key is employed in association with the images and color planes to cause a raster image processor to select, or ignore, color planes and thereby enable printing of a plurality of multi-versioned documents from a common image file set. The bearing assembly includes a first bearing member defining a first cavity and a second bearing member defining a first cavity. The document may be accessed by a requesting entity to determine which portions of a query should be encrypted prior to sending the query to a database server over a network. Accordingly, processes are simplified so that manufacturing costs may be reduced and productivity may be improved. The seat platform also includes two telescoping climbing arms which the user can grasp when moving the two platforms up a tree.