Transparent ruler having longitudinally positioned colored area
Triggering device for combustion detector
Turns-counting dial
Unit conversion label
Vacuum cleaner dust container filling indicator device
Vehicle parts indicating instrument
Visual burglar alarm
Visual indicator for a fluid operated system
Warning and protective device
Warning device for compressed air tanks
Warning signal device for respirators
Warning signal producing device for protective breathing apparat
Warning system with pneumatic function generator
Water collection indicator device
Water-wheel bathtub float alarm
Window-door alarm