Optical temperature indicator using thermochromic semiconductors

Ornamental vehicle identification device

Oscillating signal for bicycles

Output air supply hazard annunciator

Over inflation and under inflation indicator for tires

Over temperature alarm indication apparatus

Over-height vehicle barriers

Over-height vehicle barriers

Over-temperature indicator device for freezers

Over-temperature warning device

Overhead barrier warning system for trucks or buses

Overheated-axle indicator device

Overheating axle warning device

Overinflation indicator for tracheal tubes

Owl with intermittent powered movement

Owl with spring connected head and wind activated fin

Oxygen detector sheet and oxygen detecting agent using the...