Coiled bookmark

Color change nipple

Colorimetric gas dosimeter

Combination bookmark display device

Combination freeze indicators

Combination hazardous liquid and water sensor

Combination knob and dial control for cold control devices

Combination line marker and test station

Combination meter

Combination pen holder and bookmark/placesaver

Combination pill bottle cap and indicator device

Combination pill bottle cap and indicator device

Combination vehicle parking place locator coin and keyholder

Combined mine probe and marker

Compact gauge assembly

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