US PATENT SUBCLASS 104 / 56
.~ Helical

Current as of: June, 1999
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104 /   HD   RAILWAYS

53  DF  AMUSEMENT {25}
56.~ Helical {1}
57  DF  .~.~> Rotating

DEFINITION

Classification: 104/56

(under subclass 53) Apparatus comprising a track in helical form, which may vary to substantially spiral form with substantially vertical axes.