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: The first "spy" cameras emerged in the late 19th century, such as Robert D. Gray's 1885 buttonhole camera. The industry was further revolutionized in the 1930s by the Minox subminiature camera.

: Recording technology became available to the public in the late 1960s, eventually moving from bulky business systems to affordable residential options by the 1980s. Investigative Power and Social Impact Hidden Camera Activism: Overview | Visual Arts - EBSCO hidden camera video

Surveillance technology has advanced significantly from early military and professional roots to modern accessibility: : The first "spy" cameras emerged in the

: Modern video surveillance (CCTV) began during World War II when German engineers used it to safely monitor V-2 rocket launches from a distance. hidden camera video