STOCK PURCHASE AGREEMENT By and Among HELIX WIND, CORP., VENCO POWER GmbH and FIBER-TECH PRODUCTS GmbH, WESER ANLAGENTECHNIK BETEILIGUNGS GmbH AND CLANA POWER SYSTEMS GmbH, the Sellers, and DR. MATTHIAS PFALZ, ANDREAS GORKE AND REINHARD CALIEBE, the...