216 A.2d 717 COMPTROLLER OF THE TREASURY, STATE OF MARYLAND v. THE CHESAPEAKE AND POTOMAC TELEPHONE COMPANY OF MARYLAND [No. 187, September Term, 1965.]Court of Appeals of Maryland. Decided February 9, 1966. TAXATION — Retail Sales — Supplying Of Private Line Teletypewriter Communication Facilities Constituted Rendition Of Communication Service Exempted From Tax, And Not Mere […]