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Please add a detailed non-free use rationale for each article the image is used in, which must also declare compliance with the other parts of the non-free content criteria, as well as the source of the work and copyright information. For example non-free use rationales, see Wikipedia:Use rationale examples.
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Recordings would contain tones to signal the projectionist to advance the filmstrip to the next frame. Later technical improvements allowed higher-end projectors to advance the film automatically through the use of inaudible recorded tones. School children in the 1960s and 1970s found the displays a welcomed treat and now remember them fondly.
Other sampling frames can include employment records, school class lists, patient files in a hospital, organizations listed in a thematic database, and so on. [1] [5] On a more practical levels, sampling frames have the form of computer files. [1] Not all frames explicitly list population elements; some list only 'clusters'.
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Michaela Community School is a free school with sixth form in London. A free school in England is a type of academy established since 2010 under the Cameron–Clegg government's free school policy initiative. [1] From May 2015, usage of the term was formally extended to include new academies set up via a local authority competition. [2]