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Class Information
Number:
33/351
Name:
Geometrical instruments
>
Indicator of direction of force traversing natural media
> Diverse directional indicator
Description:
Device provided with (1) two different types of directional indicators, or (2) two different kinds of the same type, e.g., bubble and float.
Sub-classes under this class:
Class Number
Class Name
Patents
33/352
Includes magnetic compass
41
33/353
Line plumb and bubble level
6
Patents under this class:
Patent Number
Title Of Patent
Date Issued
7146740
Methods and apparatus for automatic magnetic compensation
Dec. 12, 2006
6860023
Methods and apparatus for automatic magnetic compensation
Mar. 1, 2005
6779276
Level system
Aug. 24, 2004
6304195
Device for altering the course of a boat
Oct. 16, 2001
5952570
Horizontal speed indicator for rotary-wing aircraft
Sep. 14, 1999
5210954
Clinometer
May. 18, 1993
4838379
Geophone implanting and positioning apparatus
Jun. 13, 1989
4394799
Conduit bending plane indicator
Jul. 26, 1983
4151656
Manually manipulatable gyroscope-stabilized indicating apparatus and method for its use
May. 1, 1979
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