US PATENT SUBCLASS 416 / 73
.~.~.~ Arcuate planar folding of working surface

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

69  DF  OPERATOR SUPPORTED MANUALLY ACTUATED TYPE {4}
70 R  DF  .~ Operation solely by direct hand manipulation {3}
72  DF  .~.~ Relatively movable portions {1}
73.~.~.~ Arcuate planar folding of working surface

DEFINITION

Classification: 416/73

(under subclass 72) Apparatus comprising a working member foldable into a more compact form by angular movement of different portions thereof about a common pivot normal to the member work surface.