We have four different tools to use for a blow out. The goose neck thing on the far left I know nothing about. I think it can be used with the black globe on the far right? The yellow bellows is from Germany; it's called Blas-fix. We purchased it from the Ukrainian Gift Shop years ago. It came with a hand drill - you can see them in the box, they have green handles. Once upon a time we had two, but we learned that it doesn't hold up well in a high stress environment like a class. The black bulb is also from the Ukrainian Gift Shop. It's called Aunt Marge's Egg blower. I believe it is an in shop developed product, as its packaging matches some of the other things we have purchased that they themselves have put together. I did say we had four things for blowing out eggs; the last and probably least obvious from the picture is the time honored method of hand, mouth blown.
The traditional method of blowing eggs out requires that you poke two holes in either end of the egg [carefully] and then with gentle pressure, blow air through one of the holes, expelling the egg membrane through the other end.
With the Blas-fix, air is forced through the hole at the bottom of the egg through the bellows by the narrow straw; pressure in the egg forces the membrane out through the hole. Nice and neat. Unless you go crazy with either method and force too much air into the egg, in which case it will pop open.