[seismic]

http://www.metalkat.gr/index.php?opt...-04&Itemid=146

3,54 g https://www.youtube.com/watch?v=RoM5pEy7n9Q

https://www.youtube.com/watch?v=zhkUlxC6IK4

2,00 g https://www.youtube.com/watch?v=Q6og4VWFcGA
United States Patent 9,540,783
http://patft.uspto.gov/netacgi/nph-P...F9%2C540%2C783