Roman Piotrowski
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Savonius Wind Turbine - Google Search

ham antenna building | ANTENNA DIMENSION CHART

http://blog.gunspec.com/wp-content/uploads/2012/10/GunSpec-Reticle-Infochart-2012.jpg

http://blog.gunspec.com/wp-content/uploads/2012/10/GunSpec-Reticle-Infochart-2012.jpg

Sniper Rifles

Sniper Rifles

Ideal emergency power configuration

Building an Arduino-powered Enigma machine | Bits & Pieces from the Embedded Design World

Vertical Axis Wind Turbine by hooptey.