top left: homemade, 2 liter plastic bottle. used for protection against tear gas.
http://www.dangerousminds.net/comments/ows_workshop_make_your_own_gas_mask_for_5
http://www.wackyuses.com/gasmask.html
http://platinumlynx.blogspot.com/2009/09/blue-peter-home-made-gas-mask-for.html
http://inventivemind.blogspot.com/2011/11/make-diy-gas-mask.html
http://occupiedpalestine.wordpress.com/2011/01/28/how-to-make-a-tear-gas-mask-howto-protection-at-protest/
top right: homemade, with a snorkel and tin can
http://www.instructables.com/id/GasMask/
bottom left: pocket size
http://technabob.com/blog/2010/02/17/firescuba-pocket-gas-mask/
bottom right: smoke hood
http://www.thetravelinsider.info/travelaccessories/evacu8smokehood.htm
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