shaking chair / Fire extinguisher case / chair

(Fire extinguisher shaking chair)
If you leave fire extinguisher unused for to long, powder will set hard.
Fire extinguisher is not working at emergency
If shake fire extinguisher,it long use.
without special action as usual.
Sit this chair, fire extinguisher is revolved, through the agency of weigh.
So fire extinguisher powder have mixed well.