A simple valve released the pressure and sprayed the dry chemical onto the fire. Iterations of those designs are still in use ...

Portable fire extinguishers may be used by those trained in their use on fires of limited size, while not placing themselves or others in danger. Fires consisting of ordinary combustibles, such as ...

Fire extinguishers are the most recognizable tool ... have one extinguisher per 3,000 square feet. There have been all kinds ...