Protecting shell device for fireman, has two orifices of specific millimeter diameter fixed at each of ends of flat base, where device is in shape of helmet, and is fixed at two points of tissue strip through fixation

摘要

The device has a flat base (1), whose circumference is of 30 millimeter, and two orifices (2) of 0.5 millimeter diameter are fixed at each of ends of the base, where the device is in the shape of helmet of fireman. The device is fixed at two points of a tissue strip through a fixation (8). Total length of the device is 450 millimeter, and total depth is 280 millimeter, inner depth is 250 millimeter and height is 280 millimeter. Two mini-buzzers are provided on each side.