US PATENT SUBCLASS 416 / 72
.~.~ Relatively movable portions

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.~.~ Relatively movable portions {1}
73  DF  .~.~.~> Arcuate planar folding of working surface

DEFINITION

Classification: 416/72

(under subclass 70) Apparatus in which major portions of the impeller are movable with respect to each other while remaining connected.

(1) Note. This definition does not include a mere indiscriminately flexible member.