|
US4227405A
|
|
Digital mineral logging system
|
|
US4293815A
|
|
Fluxgate magnetometer circuit with earth's field elimination
|
|
US4227404A
|
|
Digital mineral logging system
|
|
US3720910A
|
|
High resolution telemetry for random pulse outputs
|
|
US3610934A
|
|
Automatic focusing system utilizing means for alternately directing light over two paths having slightly different lengths
|
|
US3512176A
|
|
Light beam oscillograph
|
|
US3482255A
|
|
Compensation control system for cathode-ray recording tube
|
|
US3319960A
|
|
Pellet target employing a freely suspended elastomeric impact sheet
|
|
US3444721A
|
|
Mobile gas leak detection
|
|
US3268858A
|
|
Formation porosity exploration
|
|
US3252541A
|
|
Solid array seismic monitor system
|
|
US3031634A
|
|
Strain gauge
|
|
US2974632A
|
|
Apparatus for developing electrostatic image
|
|
US2904000A
|
|
Magnetic-brush developer
|
|
US2870312A
|
|
Fixer for electrostatic photography
|
|
US2822779A
|
|
Developer for electrostatic photography
|
|
US2986442A
|
|
Electrophotographic oscillograph for observing slow recurrent signals
|
|
US2852330A
|
|
Recording meter
|
|
US2800549A
|
|
Pressure actuated circuit maker and breaker
|
|
US2651769A
|
|
Seismic vibration detector
|
