(under subclass 26) Subject matter in which the supported element is guided in its sliding or line movement in a cylindrical bore means which constitutes the outer member.
(1) Note. Where the guiding action is secondary, as in a piston, see the appropriate art class.
(2) Note. Borehole or well casing contacting structure is classified in Class 175 subclass 325 even though specific wear surface structure is claimed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
14, and 28, for bearings used with valve stems.
SEE OR SEARCH CLASS
166, Wells, 241.1+, for centering or friction drag means for well devices, the primary purpose of which is to center the device while stationary or to act as a relatively stationary point of reference to enable manipulation of a well device.
