• 5 Videos, Slides, Films

• 4 History
• 3 Inventions
• 1 Digital media
• 1 Edison, Thomas A. (Thomas Alva), 1847-1931
• 1 Electrical engineers
• 1 Electricity
• 1 Electronics
• 1 Mechanics
• 1 Phonograph
• 1 Photography
• 1 Power (Mechanics)
• 1 Social aspects
• 1 Technology
• 1 Television
• 1 Tesla, Nikola, 1856-1943

• 5 Films Media Group
• 5 Films for the Humanities & Sciences (Firm)
• 3 BBC Worldwide Ltd

• 5 English

• 2 United States

• 5 Educational films
• 2 Video recordings for the hearing impaired

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