US PATENT SUBCLASS 52 / 55
.~.~ Relatively movable covering sections

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

45  DF  RAILROAD CAR ROOF CONSTRUCTION {4}
54  DF  .~ Central discrete ridge member {1}
55.~.~ Relatively movable covering sections

DEFINITION

Classification: 52/55

(under subclass 54) Structure including relatively movable roof sheets, usually to compensate for car motion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

204.1+, for another construction with a feature for a closure, e.g., a removable panel over an opening.

573.1, for a residual structure having means accommodating a dimensional variation responsive to varying conditions.