Revision history of "File:1970s Opportunity Knocks clapometer.jpg"

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• (cur) (prev) 22:24, 9 January 2022 Jturner (Talk | contribs) (284 bytes) (Inner workings of a 1970s "audience reaction indicator" clapometer from the National Science and Media Museum, Bradford. The museum's write-up states "We can’t tell for sure how accurate it was — or if it actually worked — but if it is a glorified p)

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