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Telecommunications is a field dedicated to systems that transmit data, text, sound and video between users. Telecommunications professionals also maintain the services for these systems, including telephones, internet access, and cable and satellite television.
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Answer:
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A competing device is the Camera Lucida . "Camera Obscura" means "dark room", and the use of a pinhole in a window blind to form an inverted image of an outside scene on an opposite wall of a dark room.