US PATENT SUBCLASS 33 / *
.~ Level or plumb, terrestrial gravitation responsive

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

*  DD  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {1}
*.~ Level or plumb, terrestrial gravitation responsive {1}
FOR 100  DF  .~.~> Electrically actuated signal or indicator (33/366)