Combined mine probe and marker

Combined personal identification, safety, and convenience device

Combined road marker and interchangeable sign cards

Combined safety whistle with article holding means

Combined speedometer and tachometer

Combined underinflation indicator and relief valve

Combined whistle and environmental instruments

Command bar system

Compact gauge assembly

Compact safety cone

Compact, low-cost, rotary knob with indicator

Compact, stowable marker device for underwater location

Composite tool having wear indicator

Compression pressure indicator

Condensation-collecting element and method

Condensed retractable safety marker

Condensed retractable safety marker

Condition change indicator

Condition detecting apparatus

Condition indicating device for a puffer type load break switch