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This tape shows how the discovery of the electromagnet made possible the invention and development of the telephone, radio, television, and satellite telecommunications.
International Film Bureau, Inc., 332 S. Michigan Ave., Chicago, IL 60604-4382, Phone: (312)427-4545, Fax: (312)427-4550
                  Available on  VHS
        
                  Running time 20 minutes.
        
              
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