Image:Air gun hg.jpg

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Description	Air gun with a volume of 30 liter, used to produce sound waves for marine refraction seismics. Maintenance during an expedition of the German polar research vessel POLARSTERN to the South Atlantic
Source	own work
Date	1986
Author	Hannes Grobe 23:25, 16 December 2006 (UTC), Alfred Wegener Institute for Polar and Marine Research, Bremerhaven
Permission (Reusing this image)	Own work, share alike, attribution required (Creative Commons CC-BY-SA-2.5)

I, the copyright holder of this work, hereby publish it under the following license: This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license

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