US PATENT SUBCLASS 52 / 53
.~ Transverse sustaining rib integral with covering

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

45  DF  RAILROAD CAR ROOF CONSTRUCTION {4}
53.~ Transverse sustaining rib integral with covering

DEFINITION

Classification: 52/53

(under subclass 45) Structure comprising one or more transversely extending ribs formed integrally with the roof sections, and rib being substantially coextensive with the transverse dimension of the roof.