As to the question of rules regarding when and where peaceful protests may be held, that's highly dependent on the specific location of the protest.
The venturi mask, also known as an air-entrainment mask (and sometimes by the brand name VentimaskÂ®), is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy.
What Are Flash Suppressors. The purpose of a flash suppressor, or flash hider, as referred to by some manufacturers, is to guard the shooter from a significant portion of the visible flash. In fact, another term for the device is flash guard, although you donât hear that used very often.