4M Sigma Corporation is an aerospace manufacturing company based in Seattle, Washington, USA. They specialize in the design, manufacture, and maintenance of commercial and defense homeland security flightline, hangar, backshop test equipment, operational support equipment, airframe cable assemblies, and safety training equipment.
With a mission to continuously contribute to the safety of flight, 4M Sigma Corporation is committed to producing quality, innovative products and providing responsive service to their customers. Their environmentally immune, minimal displacement volume, low weight, and No-FOD design Shorting Adapters have been cost-effectively meeting the airworthiness directives for airline carriers worldwide.
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