In Germany and other countries eggs used for cooking were not broken, but the contents were removed by making a hole from the end of each egg with a needle and blowing the contents into a bowl.

This seal is normally made by holding the torch flame stationary, blowing out a hole in the main glass body to match a second tube (hose connection in this example).

The utility model discloses a blanking hole of a dust collector, which is further provided with a blowing device which is used to blow out dust in a blanking channel at regular.