(under subclass 31) Drawbridge having gates whose operation involve some feature specific to bridges.
SEE OR SEARCH THIS CLASS, SUBCLASS:
37, for hinged-section Bascule bridges.
SEE OR SEARCH CLASS
49, Movable or Removable Closures, appropriate subclasses, for closures of the type provided for, and see the search notes in section IV of Class 49, for the loci of closures in other classes.
160, Flexible or Portable Closure, Partition, or Panel, for gates (1) in the form of panel units in which a flexible fabric or other flexible sheet material forms the panel portion, (2) panel units formed of plural strips, slats or panels interconnected for relative motion (excluding those connected only by a common operator or mounted only on a common support or in a common frame), where the relation to a bridge or the features of bridge structure are not claimed.
405, Hydraulic and Earth Engineering, 87+, for water control gates.
