NATIONAL GUARDIAN <NATG> MAKES ACQUISITIONS National Guardian Corp said it has acquired a number of security services companies recently, with aggregate revenues of about 3,500,000 dlrs, for an aggregate cost of about 2,700,000 dlrs. It said it acquired guard service companies C.S.C. Security Gaurd Service of Paramus, N.J., from Cartel Security Consultants Inc, the Guard Services Division of Security Services of America of Wayne, N.J., Capital Investigations and Protective Agency of Hackensack, N.J., and Meyer Detective Agency Inc of National Park, N.J. The company said it bought alarm service operations Certified Security Services Inc of Key West, Fla., Custom Security Services of Myrtle Beach, S.C., A-T-E Security Group Inc of Houston and the Louisville, Kent and Nashville, Tenn, offices of Wells Fargo Alarm Services.