IMARK Group, Oxon Hill, Md., recently added A-C Electrical Supplies, Smithtown, N.Y., and DXP Enterprises, Houston, Texas, as new members of the group. Founded in 1952, A-C offers a full line of electrical and lighting products for the residential and contractor markets. DXP has been in the distribution business for more than 90 years and has 54 locations.

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