US PATENT SUBCLASS 33 / 305
.~.~ Etching or marking liquid determines orientation

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
304  DF  .~ Borehole direction or inclination {6}
305.~.~ Etching or marking liquid determines orientation

DEFINITION

Classification: 33/305

(under subclass 304) Device wherein said determining means includes a liquid which reacts with or makes an impression on a cylinder or platen to record the deviation of the borehole.