I don't think that airgun got anything to do with us airguns ...lol.. but the idea is good. It reminds me what chaunsey is working on (cooper-t.com) with his new shark airgun that he just got not too long ago. He wanted to make the air gun to fully auto. .....
The gun is a seismic gun. They use these to make a loud bang, which bounces off the ocean floor for mapping the ocean (a form of sonar). I'm assuming Mobil owns the patent because it was made for them to explore the seabed for petroleum deposits.