SANTA FE, N.M., Aug. 3, 2011 /PRNewswire/ -- Sigma Labs, Inc. (OTCBB: SGLB.OB). Sigma Labs, Inc. announced today that it received a contract from Alcoa, Inc.
to demonstrate the feasibility of applying Sigma Labs' In-Process Quality Assurance (IPQA) technology to the welding of advanced aluminum structures. Sigma Labs expects this exploratory
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