Designation of Engr. MANUEL B. CASAS, as Officer-in-Charge, Bureau of Telecommunications. Category: Department OrderSeries: 1973No: 40File: DO_040_S1973.pdfDate: Monday, September 3, 1973Tags: Designation MANUEL CASAS Officer-in-ChargeBureau of Telecommunications 040 Read more about Designation of Engr. MANUEL B. CASAS, as Officer-in-Charge, Bureau of Telecommunications.