Periscopic sextant

Personal direction finding apparatus

Phase locked gyroscope wheel supply for synchronous...

Phase modulated fiber optic gyro accommodating angular rate...

Phase modulated fiber-optic gyroscope

Phase reading fiber optic interferometer

Phase-locked laser gyroscope system

Photo positioning system

Photoelectric rangefinding system using charge transfer devices

Photoelectrically sensed magnetic compass

Photogrammetric apparatus

Photogrammetric process for three-dimensional monitoring of...

Photographic recording apparatus

Photographically measuring an object

Pick off, torquer and reference signal generator for free...

Pick-off arrangements

Pick-off devices

Pick-off devices for gyroscopic apparatus

Pickoff mounts for gyroscopes and other devices

Picture hanger aid and aligning device