US PATENT SUBCLASS 105 / 448
.~.~ Z-fold riser

Current as of: June, 1999
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105 /   HD   RAILWAY ROLLING STOCK

443  DF  STEPS {6}
447  DF  .~ Folding {1}
448.~.~ Z-fold riser

DEFINITION

Classification: 105/448

(under subclass 447) Steps in which step-riser or link connection is pivoted to the adjacent step-treads, so that they may be folded together.