Broadcasting

11 November 1987

Am Broadcasting / Wireless / Broadcasting / Telecommunications Engineering / Electrical Engineering

09 September 1988

Wireless / Electronics / Telecommunications / Radio / Broadcasting

11 November 1989

Radio / Broadcasting / Telecommunications / Technology / Entertainment (General)

09 September 1989

Inca Empire / Peru / Francisco Pizarro / Andes / Broadcasting

11 November 1990

Radio / Telecommunications Engineering / Electronics / Wireless / Broadcasting

12 December 1990

Search And Rescue / C Span / Wireless / Broadcasting / Television

12 December 1991

Wireless / Telecommunications Engineering / Broadcasting / Technology / Electronics

09 September 1991

Erie Canal / Federal Communications Commission / Canal / Radio / Broadcasting

11 November 1992

Radio / Am Broadcasting / Amateur Radio / Balloon (Aeronautics) / Broadcasting

11 November 1993

Antarctica / Radio / Broadcasting / Telecommunications / Technology

09 September 1994

Broadcasting / Telecommunications / Radio / Electronics / Telecommunications Engineering

09 September 1993

Amateur Radio / Radio / Battery (Electricity) / Wireless / Broadcasting

11 November 1995

Am Broadcasting / Telecommunications / Radio / Broadcasting / Telecommunications Engineering

09 September 1995

Am Broadcasting / Electronics / Telecommunications / Telecommunications Engineering / Broadcasting

12 December 1996

Frequency Modulation / Telecommunications / Wireless / Broadcasting / Electrical Engineering

Televisión Digital

Digital Television / Television / High Definition Television / Television Technology / Broadcasting

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