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Cernium Corporation is one of the leading companies in the Business Services sector.
National Guardian Security Services is a Richardson, TX-based company in the Business Services sector.
Yarnell Security Systems is a Lancaster, PA-based company in the Business Services sector.
Northland Institute is a Hopkins, MN-based company in the Business Services sector.
Ace Security Inc is a Haledon, NJ-based company in the Business Services sector.