obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving

obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving

a filter that removes dust from the air that passes through it

a filter that removes dust from the air that passes through it

a filter that removes dust from the air that passes through it

a filter that removes dust from the air that passes through it

a filter that removes dust from the air that passes through it

a filter that removes dust from the air that passes through it

the flow of air

the flow of air