US PATENT SUBCLASS 33 / 457
.~.~.~ Navigational

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
452  DF  .~ Plural straightedges, relatively moveable {6}
456  DF  .~.~ Multipivoted straightedges {3}
457.~.~.~ Navigational

DEFINITION

Classification: 33/457

Navigational:

(under subclass 456) Subject matter comprising a device specially designed for plotting or computing a given course through the air or on land or water.

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431, for similar type of navigation devices having a base.

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235, Registers,

61, for calculating machines for mechanically performing the various mathematical functions.