Telephones. Denver. Dial Announcements of and reports on conversion to dial service. Post Feb. 28, 1938 p.1 Post Oct. 29, 1938 p.5 New system of dialing numbers soon to go into effect. RMN Sept. 17, 1961 p.39 Alphabetical prefixes to be dropped after July 1. RMN Dec. 9, 1962 p.5
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