US PATENT SUBCLASS 33 / 431
.~.~ Navigation

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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
431.~.~ Navigation

DEFINITION

Classification: 33/431

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(under subclass 403) Subject matter comprising a device specially designed for plotting or computing a given course through the air or on land and water.

SEE OR SEARCH CLASS

235, Registers,

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