Spirit level

Spirit level and manufacturing process for producing it

Spirit level with sliding measurement system

Spirit level with top window mounting

Spirit level with translucent spirit vial housings

Spring-driven gyroscope

Stabilization control circuit for vertical position in an...

Stabilized magnetic compass

Stabilized solid state ring laser gyro with no dead zone

Stable gyroscope erector

Standby instrument for aircraft

Star sightings by satellite for image navigation

Star tracker system

Start-up conditioning means for an azimuth reference

Static balancing adjusting apparatus for sensitive instruments

Static friction free altimeter

Statutory survey iron post puller

Steerable windowed enclosures

Stellar dial navigation system

Stereocompiler