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Dynalec Corporation - Sound Powered Communications (SPC) Division manufactures sound powered telephones for general industry and, under the name VisitPhone, visitation telephones for the corrections market. SPC's sound powered telephones are found in industrial plants throughout the country and its System 500 visitation phone system in over 500 correctional facilities in the U.S. and Canada. Choose a link above to view catalogs of our various products. For additional information, technical assistance or sales please call us at 800-431-0033/315-483-6923 or e-mail us at firstname.lastname@example.org.