(under the class definition) Instruments peculiarly adapted to use in conducting a craft on or through a fluid medium.
SEE OR SEARCH THIS CLASS, SUBCLASS:
147, for devices for determining the forces on objects such as aerofoils caused by relative motion with respect to fluids in wind tunnels.
227+, for straight-line-light-ray instruments useful in conducting a craft on or through a fluid medium.
300+, for direction indicating instruments responsive to gyroscopic forces or to terrestrial gravitation or magnetism and useful in conducting a craft on through a fluid medium.
466+, and 467, for plotting devices.
490, for a device measuring distance by integrating a speed response and time. 503, for a device indicating velocity with respect to the earth by integrating time and acceleration.
504.02+, for an instrument operated by the combined action of a gyroscope and a speed or acceleration sensor.
504.03, and 514.01+, for means measuring change of orientation by acceleration responsive means.
514.01+, for an accelerometer.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
715, and 720 for line and lead type sounding devices.
116, Signals and Indicators,
113, for shoal water alarms, and subclass 27 for nonelectrical submarine signaling devices.
235, Registers,
61, and appropriate indented subclass, particularly subclass subclasses 401 and 402 for bombing calculators incorporating navigation systems. 244, Aeronautics,
76+, for aircraft control apparatus employing measuring devices.
340, Communications: Electrical, and
29+, for other nautical signaling systems.
346, Recorders, appropriate subclass.
356, Optics: Measuring and Testing,
247+, for fiducial instruments involving significant optics or a deflection of the line of sight by reflection or refraction principles.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
87+, for acoustic echo navigation systems; and subclasses 118+, for other acoustic navigation systems.
368, Horology: Time Measuring Systems or Devices, for chronometers.
374, Thermal Measuring and Testing,
6, for position determination by thermal measurement. 396, Photography, particularly
7+, for aerial cameras.
434, Education and Demonstration,
111, 186, and 239+ for devices for teaching or training in the use of navigating instruments or for such devices when combined with devices for training in the operation of aircraft.
701, Data Processing: Vehicles, Navigation, and Relative Location,
