Cothren, Graff, Smoak Engineering. Inc. » Membership Directory 1 Associate Members | Corporate Members | Honorary Members | Entire List Go back to directory. Add to Address Book. Cothren, Graff, Smoak Engineering. Inc. Cothren, Graff, Smoak Engineering. Inc. Contact: Mr. Randall Smoak Work 6305 Westport Ave. Shreveport LA 71129 work Work Phone: 318/687-3732work Work Fax: 318/687-1049workfax Work Email: firstname.lastname@example.orgINTERNET Categories: Associate Members Updated 2 years ago.